Learning never exhausts the mind. Read Summary
There are three classes of people: those who see, those who see when they are shown, those who do not see. Read Summary
Nature is the source of all true knowledge. She has her own logic, her own laws, she has no effect without cause nor invention without necessity. Read Summary
I have been impressed with the urgency of doing. Knowing is not enough; we must apply. Being willing is not enough; we must do. Read Summary
I have offended God and mankind because my work didn't reach the quality it should have. Read Summary
Why does the eye see a thing more clearly in dreams than the imagination when awake? Read Summary
Iron rusts from disuse; water loses its purity from stagnation... even so does inaction sap the vigor of the mind. Read Summary
Who sows virtue reaps honor. Read Summary
He who loves practice without theory is like the sailor who boards ship without a rudder and compass and never knows where he may cast. Read Summary
Intellectual passion drives out sensuality. Read Summary