When you seek advice, do not withhold any facts from the person whose advice you seek.
— Abu Bakr

The demand for certainty is one which is natural to man, but is nevertheless an intellectual vice. ... But so long as men are not trained to withhold judgment in the absence of evidence, they will be led astray by cocksure prophets, and it is likely that their leaders will be either ignorant fanatics or dishonest charlatans. To endure uncertainty is difficult, but so are most of the other virtues.
— Bertrand Russell

A poet's pleasure is to withhold a little of his meaning, to intensify by mystification. He unzips the veil from beauty, but does not remove it.
— E.B. (Elwyn Brooks) White

If I thought that a smile of mine, might linger the whole day through and lighten some heart with a heavier part, I'd not withhold it -- Would you?
— Unknown

Every other enjoyment malice may destroy; every other panegyric envy may withhold; but no human power can deprive the boaster of his own encomiums.
— Samuel Johnson