Each thought is a little hammer blow on the lump of iron which our bodies are manufacturing out of it what we want it to be.
We are what our thoughts have made us; so take care of what you think. Words are secondary. Thoughts live, they travel far. Each thought we think is tinged with our character, so that for the pure and holy man, even his jests or abuse will have the twist of his own love and purity and do good.
Every vicious thought will rebound, every thought of hatred which you may have thought, in a cave even, is stored up, and will one day come back to you with tremendous power in the form of some misery here. If you project hatred and jealousy, they will rebound on you with compound interest. No power can avert them; when once you have put them in motion, you will have to bear them. Remembering this will prevent you from doing wicked things.