All our knowledge has its origins in our perceptions.

Abbreviators do harm to knowledge and to love.

All knowledge which ends in words will die as quickly as it came to life, with the exception of the written word: which is its mechanical part.

Whoever in discussion adduces authority uses not intellect but rather memory.

All sciences are vain and full of errors that are not born of Experience, the mother of all Knowledge.

For, verily, great love springs from great knowledge of the beloved object, and if you little know it, you will be able to love it only little or not at all.