Nature herself has imprinted on the minds of all the idea of God - Cicero

Now since perturbations of mind create misery, while quietness of mind makes life happy, and since there are two kinds of perturbations, grief and fear having their scope in imagined evils, inordinate joy and desire in mistaken notions of the good, all being repugnant to wise counsel and reason, will you hesitate to call him happy whom you see relieved, released, free from these excitements so oppressive, and so at variance and divided among themselves? Indeed one thus disposed is always happy. Therefore the wise man is always happy.

For what, in the name of heaven, is more to be desired than wisdom? What is more to be prized? What is better for a man, what more worthy of his nature? Those who seek after it are called philosophers; and philosophy is nothing else, if one will translate the word into our idiom, than ‘the love of wisdom.’ Wisdom … is ‘the knowledge of things human and divine and of the causes by which those things are controlled.’ And if the man lives who would belittle the study of philosophy, I quite fail to see what in the world he would see fit to praise.

Of this last kind of comparisons is that quoted from the elder Cato, who, when asked what was the most profitable thing to be done on an estate, replied, “To feed cattle well.” “What second best?” “To feed cattle moderately well.” “What third best?” “To feed cattle, though but poorly.” “What fourth best?” “To plough the land.” And when he who had made these inquiries asked, “What is to be said of making profit by usury?” Cato replied, “What is to be said of making profit by murder?