In Book X of Plato’s Laws, Plato tries to demonstrate the existence of the gods. His argument is complex and ambiguous. My interpretation of his argument is the following: 1) there are things in motion, 2) matter can move other matter, but it cannot move itself, 3) the soul can move itself and matter, 4) because matter is in motion, a soul must have moved it, 5) a soul capable of moving and arranging the heavens is a god.
After presenting his argument, Plato then legislates that all impious non-believers be imprisoned, reformed, or executed. Such a legal stance against impiety seems common for that area of the world.
The following are interesting quotes from the text.
Now we have to determine what is to be the punishment of those who speak or act insolently toward the Gods. But first we must give them an admonition which may be in the following terms: No one who in obedience to the laws believed that there were Gods, ever intentionally did any unholy act, or uttered any unlawful word; but he who did must have supposed one of three things―either that they did not exist―which is the first possibility, or secondly, that, if they did, they took no care of man, or thirdly, that they were easily appeased and turned aside from their purpose by sacrifices and prayers.
when we hear such things said of them by those who are esteemed to be the best of poets, and orators, and prophets, and priests, and by innumerable others, the thoughts of most of us are not set upon abstaining from unrighteous acts, but upon doing them and atoning for them.
It is a matter of no small consequence, in some way or other to prove that there are Gods, and that they are good, and regard justice more than men do. The demonstration of this would be the best and noblest prelude of all our laws. And therefore, without impatience, and without hurry, let us unreservedly consider the whole matter, summoning up all the power of persuasion which we possess.
O my son, we will say to him, you are young, and the advance of time will make you reverse many of the opinions which you now hold. Wait awhile, and do not attempt to judge at present of the highest things; and that is the highest of which you now think nothing―to know the Gods rightly and to live accordingly. And in the first place let me indicate to you one point which is of great importance, and about which I cannot be deceived: You and your friends are not the first who have held this opinion about the Gods. There have always been persons more or less numerous who have had the same disorder. I have known many of them, and can tell you, that no one who had taken up in youth this opinion, that the Gods do not exist, ever continued in the same until he was old; the two other notions certainly do continue in some cases, but not in many; the notion, I mean, that the Gods exist, but take no heed of human things, and the other notion that they do take heed of them, but are easily propitiated with sacrifices and prayers. As to the opinion about the Gods which may some day become clear to you, I advise you to wait and consider if it be true or not; ask of others, and above all of the legislator. In the meantime take care that you do not offend against the Gods. For the duty of the legislator is and always will be to teach you the truth of these matters.
They are told by them that the highest right is might, and in this way the young fall into impieties, under the idea that the Gods are not such as the law bids them imagine; and hence arise factions, these philosophers inviting them to lead a true life according to nature, that is, to live in real dominion over others, and not in legal subjection to them.
Nearly all of them, my friends, seem to be ignorant of the nature and power of the soul, especially in what relates to her origin: they do not know that she is among the first of things, and before all bodies, and is the chief author of their changes and transpositions. And if this is true, and if the soul is older than the body, must not the things which are of the soul’s kindred be of necessity prior to those which appertain to the body?
hen thought and attention and mind and art and law will be prior to that which is hard and soft and heavy and light; and the great and primitive works and actions will be works of art; they will be the first, and after them will come nature and works of nature, which however is a wrong term for men to apply to them; these will follow, and will be under the government of art and mind.
And what is the definition of that which is named ‘soul’? Can we conceive of any other than that which has been already given―the motion which can move itself?
The soul is the first origin and moving power of all that is, or has become, or will be, and their contraries. She has been clearly shown to be the source of change and motion in all things.
O thou best of men, in believing that there are Gods you are led by some affinity to them, which attracts you towards your kindred and makes you honour and believe in them. But the fortunes of evil and unrighteous men in private as well as public life, which, though not really happy, are wrongly counted happy in the judgment of men, and are celebrated both by poets and prose writers―these draw you aside from your natural piety. Perhaps you have seen impious men growing old and leaving their children’s children in high offices, and their prosperity shakes your faith―you have known or heard or been yourself an eyewitness of many monstrous impieties, and have beheld men by such criminal means from small beginnings attaining to sovereignty and the pinnacle of greatness; and considering all these things you do not like to accuse the Gods of them, because they are your relatives; and so from some want of reasoning power, and also from an unwillingness to find fault with them, you have come to believe that they exist indeed, but have no thought or care of human things. Now, that your present evil opinion may not grow to still greater impiety, and that we may if possible use arguments which may conjure away the evil before it arrives, we will add another argument to that originally addressed to him who utterly denied the existence of the Gods.
Let us not, then, deem God inferior to human workmen, who, in proportion to their skill, finish and perfect their works, small as well as great, by one and the same art; or that God, the wisest of beings, who is both willing and able to take care, is like a lazy good-for-nothing, or a coward, who turns his back upon labour and gives no thought to smaller and easier matters, but to the greater only.
The ruler of the universe has ordered all things with a view to the excellence and preservation of the whole, and each part, as far as may be, has an action and passion appropriate to it. Over these, down to the least fraction of them, ministers have been appointed to preside, who have wrought out their perfection with infinitesimal exactness. And one of these portions of the universe is thine own, unhappy man, which, however little, contributes to the whole; and you do not seem to be aware that this and every other creation is for the sake of the whole, and in order that the life of the whole may be blessed; and that you are created for the sake of the whole, and not the whole for the sake of you. For every physician and every skilled artist does all things for the sake of the whole, directing his effort towards the common good, executing the part for the sake of the whole, and not the whole for the sake of the part. And you are annoyed because you are ignorant how what is best for you happens to you and to the universe, as far as the laws of the common creation admit. Now, as the soul combining first with one body and then with another undergoes all sorts of changes, either of herself, or through the influence of another soul, all that remains to the player of the game is that he should shift the pieces; sending the better nature to the better place, and the worse to the worse, and so assigning to them their proper portion.