Racism is America's greatest disease, racism is a disease of the white man.

My only refuge, as a serious young man, from the despair of my financial burden to my family, is that I did everything I could to never permit myself any amusements or diversions except those afforded by my studies.

I wouldn't want to live if I did not have my work. In any case, it's good that I'm already old and personally don't have to count on a prolonged future.

Never do anything against conscience even if the state demands it.

Strenuous intellectual work and the study of God's Nature are the angels that will lead me through all the troubles of this life with consolation, strength, and uncompromising rigor.

But their intervention makes our acts to serve ever less merely the immediate claims of our instincts.

Great spirits have always encountered violent opposition from mediocre minds.