"Sit down and write your letter; write it with all the venom in your power; spit out your spleen at the fullest; 'twill do you good ... say all that you can say with all your poisoned eloquence, and gratify yourself by reading it while your temper is still hot. Then put it in your desk; and, as a matter of course, burn it before breakfast the following morning."
The habit of reading is the only one I know in which there is no alloy. It lasts when all other pleasures fade. It will be there to support you when all other resources are gone. It will be present to you when the energies of your body have fallen away from you. It will make your hours pleasant to you as long as you live.