“None can reply - all seems eternal now. The wilderness has a mysterious tongue, which teaches awful doubt.”

“When I view all beings not as special creations, but as the lineal descendants of some few beings which lived long before the first bed of the Cambrian system was deposited, they seem to me to beco...”

“If I had my life to live over again, I would have made a rule to read some poetry and listen to some music at least once every week.”

“A man who dares to waste one hour of time has not discovered the value of life.”

“Thus, from the war of nature, from famine and death, the most exalted object which we are capable of conceiving, namely, the production of the higher animals, directly follows. There is grandeur in...”

“We are not here concerned with hopes or fears, only with truth as far as our reason permits us to discover it.”

“All your thoughts, imagination, feelings, emotions and sensation are part of the mechanical process that can be understood, at the state of self-realization.”

“Think independently and critically, but never forget to think with understanding and love.”

“When we blindly adopt a religion, a political system, a literary dogma, we become automatons.”

“Should we not be concerned as to whether this fear of error is not just the error itself?”

“An error does not become truth by reason of multiplied propagation, nor does the truth become error because nobody will see it. 1924-1926)”

“The scientific spirit is of more value than its products, and irrationally held truths may be more harmful than reasoned errors.”

“Facts do not cease to exist because they are ignored.”

“News told, rumors heard, truth implied, facts buried.”

“She was no longer struggling against the perception of facts, but adjusting herself to their clearest perception.”