A good hypothesis in science must have other properties than those of the phenomenon it is immediately invoked to explain, otherwise it is not prolific enough.

To spend life for something which outlasts it.

It would probably astound each of them beyond measure to be let into his neighbor's mind and to find how different the scenery there was from that in his own.

The deepest human need is the need to be appreciated.

Your hopes, dreams and aspirations are legitimate. They are trying to take you airborne, above the clouds, above the storms, if you only let them.

In teaching, you must simply work your pupil into such a state of interest in what you are going to teach him that every other object of attention is banished from his mind; then reveal it to him so impressively that he will remember the occasion to his dying day; and finally fill him with devouring curiosity to know what the next steps in connection with the subject are.

In order to disprove the assertion that all crows are black, one white crow is sufficient.