People go to Africa and confirm what they already have in their heads and so they fail to see what is there in front of them.

The damage done in one year can sometimes take ten or twenty years to repair.

I prefer to go on trying all kinds of things, not to be told, This is the way it is done.

...when we are comfortable and inattentive, we run the risk of committing grave injustices absentmindedly.

Anybody who wants to rule a group will find that if this group is quarreling among themselves they leave you alone.

When the moon is shining the cripple becomes hungry for a walk

The impatient idealist says: 'Give me a place to stand and I shall move the earth.' But such a place does not exist. We all have to stand on the earth itself and go with her at her pace.