The majority believes that everything hard to comprehend must be very profound. This is incorrect. What is hard to understand is what is immature, unclear and often false. The highest wisdom is simple and passes through the brain directly into the heart.

You imagine that I look back on my life's work with calm satisfaction, but from nearby it looks quite different. There is not a single concept of which I am convinced it will stand firm, and I feel uncertain whether I am in general on the right track.

There's an understanding that is not desired to exist.