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.

Never stop learning; knowledge doubles every fourteen months.

No man's knowledge here can go beyond his experience.

Perplexity is the beginning of knowledge.