What! Would I be turned back from doing a thing that I had determined to do, and that I knew to be right, by the airs and interference of such a person, or any person I may say? No, I have no idea of being so easily persuaded. When I have made up my mind, I have made it.
With patient and firm determination, I am going to press on for jobs. I'm going to press on for equality. I'm going to press on for the sake of our children. I'm going to press on for the sake of all those families who are struggling right now. I don't have time to feel sorry for myself. I don't have time to complain. I am going to press on.
Enlightenment is man's leaving his self-caused immaturity. Immaturity is the incapacity to use one's intelligence without the guidance of another. Such immaturity is self-caused if it is not caused by lack of intelligence, but by lack of determination and courage to use one's intelligence without being guided by another. Sapere Aude! Have the courage to use your own intelligence! is therefore the motto of the enlightenment.
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.
The notion of the infinite expanse and copiousness of the cosmos is the result of the mixture, carried to the extreme limit, of laborious creation and free self-determination.