No problem is ever solved in the same consciousness thas was used to create it.

Condemnation without investigation is the height of ignorance

It is, in fact, nothing short of a miracle that the modern methods of instruction have not yet entirely strangled the holy curiosity of inquiry; for this delicate little plant, aside from stimulation, stands mainly in need of freedom; without this it goes to wrack and ruin without fail. It is a grave mistake to think that the enjoyment of seeing and searching can be promoted by means of coercion and a sense of duty.

Common sense needs constant reappraisal.

All religions, arts and sciences are branches of the same tree.

One lives one's life under constant tension, until it's time to go for good

If I had an hour to solve a problem I'd spend 55 minutes thinking about the problem and 5 minutes thinking about solutions.