All thinking men are atheists.
A man’s thinking goes on within his consciousness in a seclusion in comparison with which any physical seclusion is an exhibition to public view.[Das Denken des Menschen geht im Innern des Bewußtseins in einer Abgeschlossenheit vor sich, gegen die jede physische Abgeschlossenheit ein Offen-da-liegen ist.]
A man who means to think and write a great deal must, after six and twenty, learn to read with his fingers.
A man who does not think for himself does not think at all.
A dull mind, once arriving at an inference that flatters a desire, is rarely able to retain the impression that the notion from which the inference started was purely problematic.
“Really, now you ask me,” said Alice, very much confused, “I don’t think-” “Then you shouldn’t talk,” said the Hatter.