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Only knowledge that is used sticks in your mind.
Knowledge rests not upon truth alone, but upon error also.
Even the knowledge of my own fallibility cannot keep me from making mistakes. Only when I fall do I get up again.
All knowledge and understanding of the Universe was no more than playing with stones and shells on the seashore of the vast imponderable ocean of truth.
I know not how I seem to others, but to myself I am but a small child wandering upon the vast shores of knowledge, every now and then finding a small bright pebble to content myself with while the vast ocean of undiscovered truth lay before me.
Share your knowledge. It is a way to achieve immortality
Let us not forget that human knowledge and skills alone cannot lead humanity to a happy and dignified life.
The true sign of intelligence is not knowledge but imagination.