All the knowledge I possess everyone else can acquire, but my heart is all my own.

Never stop learning; knowledge doubles every fourteen months.

True friendship can afford true knowledge. It does not depend on darkness and ignorance.

All the knowledge I possess everyone else can acquire, but my heart is all my own.

I prefer tongue-tied knowledge to ignorant loquacity.

Knowledge is love and light and vision.

On our plane knowledge and ignorance are the immemorial adversaries.

To acquire knowledge, one must study; but to acquire wisdom, one must observe.

Perplexity is the beginning of knowledge.

The true sign of intelligence is not knowledge but imagination.