know / nō verb
  1. to be aware of something; to perceive as truth
A wise mane never knows all, only fools know everything. African Proverb  
  1. to have information firmly planted in one’s mind or memory
Everything we know by heart enriches us and helps us find ourselves. Nadia Boulanger, 1887-1979  
  1. to be familiar with someone or something based on prior experience
If you know the enemy and know yourself you need not fear the results of a hundred battles. Sun Tzu, 545 BC – 470 BC  
  1. to be experienced in something
It’s not enough to know how to ride – you must also know how to fall. Mexican Proverb  
  1. to have the ability to distinguish between things
Music does not know the difference between people; it only speaks to their hearts. Riccardo Muti, 1941-