Tact is the art of making a point without making an enemy. – Howard W. Newton

I do not know what I may appear to the world, but to myself I seem to have been only like a boy playing on the sea-shore, and diverting myself in now and then finding a smoother pebble or a prettier shell than ordinary, whilst the great ocean of truth lay all undiscovered before me. – Isaac Newton (1642–1727), spoken the evening before his death

The minute a phrase becomes current, it becomes an apology for not thinking accurately to the end of the sentence. – Oliver Wendell Holmes

Vision is the art of seeing things invisible. – Jonathan Swift, “Thoughts on Various Subjects,” Miscellanies, 1711