No living person is sunk so low as not to be imitated by somebody.

Act in earnest and you will become earnest in all you do.

Don't preach too much to your pupils or abound in good talk in the abstract. Lie in wait rather for the practical opportunities, be prompt to seize those as they pass, and thus at one operation get your pupils both to think, to feel, and to do.

Procrastination is attitude's natural assassin. There's nothing so fatiguing as an uncompleted task

No more fiendish punishment could be devised, were such a thing physically possible, than that one should be turned loose in society and remain absolutely unnoticed.

Thoughts become perception, perception becomes reality. Alter your thoughts, alter your reality.

To be fertile in hypotheses is the first perquisite of creativity and to be willing to throw them away the moment experience contradicts them is the next.