“A man may well bring a horse to the water,
But he cannot make him drinke without he will.”
John Heywood (1497–1580) English writer known for plays, poems and a collection of proverbs
Part I, chapter 11.
Proverbs (1546), Bartlett's Familiar Quotations, 10th ed. (1919)
Variant: A man may well bring a horse to the water,
But he cannot make him drinke without he will.