If men do not keep on speaking terms with children, they cease to be men, and become merely machines for eating and for earning money. John Updike
Do not keep on with a mockery of friendship after the substance is gone - but part, while you can part friends. Bury the carcass of friendship: it is not worth embalming. William Hazlitt
Can a woman not keep her lover without she study to always please him with pleasure? Pew! Then let her give up the game. Or shall my lover think with pleasing of me to win me indeed? Faugh! He payeth me then; doth he think I am for hire? Eric Rücker Eddison
What I do not know will not keep me warm. Lower Austria Proverb
Do not keep your tongue under your belt. Irish Proverb
Honor and profit will not keep in one sack. Portuguese Proverb