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To have real knowledge, one must understand the essence of things and not only their manifestations.

Knowledge once gained casts a light beyond its own immediate boundaries.

The frontiers of knowledge in the various fields of our subject are expanding at such a rate that, work as hard as one can, one finds oneself further and further away from an understanding of the whole.

If we look at the realm of knowledge, how exceedingly small and limited is that part acquired through our own senses; how wide is that we gain from other sources.

Knowledge is the eye of desire and can become the pilot of the soul.

Everything you'll ever need to know is within you; the secrets of the universe are imprinted on the cells of your body.

Now all the knowledge and wisdom that is in creatures, whether angels or men, is nothing else but a participation of that one eternal, immutable and increased wisdom of God.

Someday in the distant cyborg future, when our internal and external memories fully merge, we may come to possess infinite knowledge. But that's not the same thing as wisdom.

Knowledge, learning, is an eternal thing.

We are living through a remarkably privileged era, when certain deep truths about the cosmos are still within reach of the human spirit of exploration.