Section 20: Teachers May Fall Short explained simply

XX. “Philosophers do not carry into effect all that they teach.” No; but they effect much good by their teaching, by the noble thoughts which they conceive in their minds: would, indeed, that they could act up to their talk: what could be happier than they would be? but in the meanwhile you have no right to despise good sayings and hearts full of good thoughts. Men deserve praise for engaging in profitable studies, even though they stop short of producing any results. Why need we wonder if those who begin to climb a steep path do not succeed in ascending it very high? yet, if you be a man, look with respect on those who attempt great things, even though they fall. It is the act of a generous spirit to proportion its efforts not to its own strength but to that of human nature, to entertain lofty aims, and to conceive plans which are too vast to be carried into execution even by those who are endowed with gigantic intellects, who appoint for themselves the following rules: I will look upon death or upon a comedy with the same expression of countenance: I will submit to labours, however great they may be, supporting the strength of my body by that of my mind: I will despise riches when I have them as much as when I have them not; if they be elsewhere I will not be more gloomy, if they sparkle around me I will not be more lively than I should otherwise be: whether Fortune comes or goes I will take no notice of her: I will view all lands as though they belong to me, and my own as though they belonged to all mankind: I will so live as to remember that I was born for others, and will thank Nature on this account: for in what fashion could she have done better for me? she has given me alone to all, and all to me alone. Whatever I may possess, I will neither hoard it greedily nor squander it recklessly. I will think that I have no possessions so real as those which I have given away to deserving people: I will not reckon benefits by their magnitude or number, or by anything except the value set upon them by the receiver: I never will consider a gift to be a large one if it be bestowed upon a worthy object. I will do nothing because of public opinion, but everything because of conscience: whenever I do anything alone by myself I will believe that the eyes of the Roman people are upon me while I do it. In eating and drinking my object shall be to quench the desires of Nature, not to fill and empty my belly. I will be agreeable with my friends, gentle and mild to my foes: I will grant pardon before I am asked for it, and will meet the wishes of honourable men half way: I will bear in mind that the world is my native city, that its governors are the gods, and that they stand above and around me, criticizing whatever I do or say. Whenever either Nature demands my breath again, or reason bids me dismiss it, I will quit this life, calling all to witness that I have loved a good conscience, and good pursuits; that no one’s freedom, my own least of all, has been impaired through me.” He who sets up these as the rules of his life will soar aloft and strive to make his way to the gods: of a truth, even though he fails, yet he “Fails in a high emprise.” But you, who hate both virtue and those who practise it, do nothing at which we need be surprised, for sickly lights cannot bear the sun, nocturnal creatures avoid the brightness of day, and at its first dawning become bewildered and all betake themselves to their dens together: creatures that fear the light hide themselves in crevices. So croak away, and exercise your miserable tongues in reproaching good men: open wide your jaws, bite hard: you will break many teeth before you make any impression.