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

Real knowledge is to know the extent of one's ignorance.

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

Knowledge is the life of the mind.

Knowledge is like money: to be of value it must circulate, and in circulating it can increase in quantity and, hopefully, in value.

Knowledge has value only insofar as it contributes to the all-round development of the whole nature of man.

Knowledge is of no value unless you put it into practice.

Knowledge is sometimes superfluous: when we need it, we have it not.

Knowledge is love and light and vision.

We can't have full knowledge all at once. We must start by believing; then afterwards we may be led on to master the evidence for ourselves.