It is permissible to enjoy moments of not understanding? Do we suffer when we understand too much?

The brain is like a muscle. When it is in use we feel very good. Understanding is joyous.
Quotation from Carl Sagan

There is no more lively sensation than that of pain; its impressions are certain and dependable. They never deceive as may those of the pleasure women perpetually feign and almost never experience.
Quotation from Marquis de Sade