All men are ignorant, just in different fields.

It is the supreme art of the teacher to awaken joy in creative expression and knowledge.

I am neither especially clever nor especially gifted. I am only very, very curious.

Imagination without knowledge may create beautiful things, knowledge without imagination can create only perfect ones.

Why does this magnificent applied science which saves work and makes life easier bring us so little happiness? ... The simple answer runs: 'Because we have not yet learned to make sensible use of it.'

Small is the number of people who see with their eyes and think with their minds.

Don't listen to their words, fix your attention on their deeds.