We cannot be sure of having something to live for unless we are willing to die for it. Che Guevara
Children are the only form of immortality that we can be sure of. Peter Ustinov
What if all everybody needed in the world was to be sure of one friend? What if you were the one, and you refused to say those simple words? Richard Russo
I wanted to change the world. But I have found that the only thing one can be sure of changing is oneself. Aldous Huxley
I always worked until I had something done and I always stopped when I knew what was going to happen next. That way I could be sure of going on the next day. Ernest Hemingway
No man can be happy without a friend, or be sure of his friend till he is unhappy. Latin Proverb