Although nature commences with reason and ends in experience it is necessary for us to do the opposite, that is to commence with experience and from this to proceed to investigate the reason.
I have been impressed with the urgency of doing. Knowing is not enough; we must apply. Being willing is not enough; we must do.
Iron rusts from disuse; water loses its purity from stagnation ... even so does inaction sap the vigour of the mind.
Just as iron rusts from disuse, even so does inaction spoil the intellect.
I have learned from an early age to abjured the use of meat, and the time will come when men such as I will look upon the murder of animals as they now look upon the murder of men
Art is never finished, only abandoned.
Where the spirit does not work with the hand there is no art
Why does the eye see a thing more clearly in dreams than the imagination when awake?
Anyone who in discussion relies upon authority uses, not his understanding, but rather his memory.
All our knowledge has its origins in our perceptions.
He who is fixed to a star does not change his mind.
Common Sense is that which judges the things given to it by other senses.
Just as courage imperils life, fear protects it.
While I thought that I was learning how to live, I have been learning how to die.
As a well spent day brings happy sleep, so a life well spent brings happy death.
Our life is made by the death of others.
The desire to know is natural to good men.
The eye sees a thing more clearly in dreams than the imagination awake.
Learning acquired in youth arrests the evil of old age; and if you understand that old age has wisdom for its food, you will so conduct yourself in youth that your old age will not lack for nourishment.
He who does not punish evil commands it to be done.
Experience does not err. Only your judgments err by expecting from her what is not in her power.
Experience does not ever err; it is only your judgment that errs in promising itself results which are not caused by your experiments
Wisdom is the daughter of experience.
The noblest pleasure is the joy of understanding.
Men of lofty genius when they are doing the least work are most active.