For many who live frugally before they fall in love become prodigal when that passion gets the mastery over them; insomuch that after having wasted their estates, they are reduced to gain their bread by methods they would have been ashamed of before. What hinders then, but that a man, who has been once temperate, should be so no longer, and that he who has led a good life at one time should not do so at another? I should think, therefore, that the being of all virtues, and chiefly of temperance, depends on the practice of them: for lust, that dwells in the same body with the soul, incites it continually to despise this virtue, and to find out the shortest way to gratify the senses only.

Xenophon (c. 431-355 BC) Greek historian and essayist

The Memorable Thoughts of Socrates, ch. 2 “Socrates No Debaucher of Youth”

Full text.