The deepest sin against the human mind is to believe things without evidence.
Maybe true travel is not the transportation of the body, but a change of perception, renewing the mind.
The hour of departure has arrived, and we go our ways. I to die, and you to live. Which is better God only knows.
Natural science does not simply describe and explain nature: it is part of the interplay between us and nature.
The first rule is not to lose. The second rule is not to forget the first rule.
Ignorance more frequently begets confidence than does knowledge: it is those who know little, and not those who know much, who so positively assert that this or that problem will never be solved by science.
He who opens a school door, closes a prison.
Logic is like the sword–those who appeal to it shall perish by it.
Keep in mind my friend, if an answer is not rational, then it is not an answer, but a delusion.”