Honest pioneer work in the field of science has always been, and will continue to be, life's pilot. On all sides, life is surrounded by hostility. This puts us under an obligation. Wilhelm Reich
No one is bound to be clever, but every one is under an obligation to be good. Jean-Louis Guez de Balzac
If a man who makes to another person, upon a solemn occasion, an assertion, upon which that person acts, he lies under an obligation to make good his assertion. John Romilly, 1st Baron Romilly
To place yourself under an obligation is to sell your liberty. Latin Proverb