I never could have done what I have done without the habits of punctuality, order, and diligence, without the determination to concentrate myself on one subject at a time.
Let positive, strong, helpful thoughts enter into your brains from very childhood. Lay yourselves open to these thoughts, and not to weakening and paralysing ones.
We have also arranged things so that almost no one understands science and technology. This is a prescription for disaster. We might get away with it for a while, but sooner or later this combustible mixture of ignorance and power is going to blow up in our faces.
If we want justice for minorities and cooled wars with our natural enemies, whether human or non-human, we must first come to terms with the minority and the enemy in ourselves and in our own hearts, for the rascal is there as much as anywhere in the "external" world - -especially when you realize that the world outside your skin is as much yourself as the world inside.
When you know both yourself as well as your competition, you are never in danger. To know yourself and not others, gives you half a chance of winning. Knowing neither yourself or your competition puts you in a position to lose.