“Wisdom is the right use of knowledge. To know is not to be wise. Many men know a great deal, and are all the greater fools for it. There is no fool so great a fool as a knowing fool. But to know how to use knowledge is to have wisdom.”

“Knowledge is like a baobab tree - one person's arms are not enough to encompass it”

“The things we really know are not the things we have merely read about or heard about, but the things we have lived, have experienced, have been sensible of”

“Nature teaches more than she preaches. There are no sermons in stones. It is easier to get a spark out of a stone than a moral”

“If we take science as our sole guide, if we accept and hold fast that alone which is verifiable, the old theology must go”

“Knowledge about life is one thing; effective occupation of a place in life, with its dynamic currents passing through your being, is another.”