It is not fit to tell others anything but what they can take up. A man understands nothing but what is commensurate with him. Goethe.
It is not from masters, but from their equals, that youths learn a knowledge of the world. Goldsmith.
It is not from nature, but from education and habits, that our wants are chiefly derived. Fielding.
It is not given to the world to be contented. Goethe.
It is not good for man to be, especially to work, 50 alone. Goethe.
It is not good to have an oar in every one's boat. Camden.
It is not good to meddle with divine mysteries. Goethe.
It is not good to pass by that we dislike, even to gain that which we like; for the water of life becometh mortal when mixed with a poison. Hitopadesa.
It is not he who gives abuse or blows who affronts, but the view we take of these things as insulting. Epictetus.
It is not his own individual sins that the hero atones for, but original sin, i.e., the crime of existence. Schopenhauer.