There is small risk a general will be regarded with contempt by those he leads, if, whatever he may have to preach, he shows himself best able to perform. Xenophon
If a person is not talented enough to be a novelist, not smart enough to be a lawyer, and his hands are too shaky to perform operations, he becomes a journalist. Norman Mailer
When superstition is allowed to perform the task of old age in dulling the human temperament, we can say goodbye to all excellence in poetry, in painting, and in music. Denis Diderot
No one can bind himself to perform the impossible. Mexican Proverb
Never step over one duty to perform another. English Proverb
If you want to perform a good jump, sometimes you need to start by taking a step back. German Proverb