مذهب اللا أدرية يعني ببساطة أن المرء لا يجب أن يقول أنه يعرف أو يصدق ما ليس له أساس يدعو للتصديق - Thomas Henry Huxley

Sit down before fact like a little child, and be prepared to give up every preconceived notion, follow humbly wherever and to whatever abyss Nature leads or you shall learn nothing.

The method of scientific investigation is nothing but the expression of the necessary mode of working of the human mind.

The extent of the region of the uncertain, the number of the problems the investigation of which ends in a verdict of not proven, will vary according to the knowledge and the intellectual habits of the individual agnostic. I do not very much care to speak of anything as unknowable. What I am sure about is that there are many topics about which I know nothing, and which, so far as I can see, are out of reach of my faculties. But whether these things are knowable by any one else is exactly one of those matters which is beyond my knowledge, though I may have a tolerably strong opinion as to the probabilities of the case.