In every bit of honest writing in the world… there is a base theme. Try to understand men, if you understand each other you will be kind to each other. Knowing a man well never leads to hate and nearly always leads to love.
To know that we know what we know, and to know that we do not know what we do not know, that is true knowledge.
We just do not see how very specialized the use of “I know” is.[Man sieht eben nicht, wie sehr spezialisiert der Gebrauch von “Ich weiß” ist.]
The salesman who knows nothing of what he is selling save that he is charging a great deal too much for it.