The important thing is not to stop questioning. Curiosity has its own reason for existing.

The important thing is not to stop questioning. Curiosity has its
own reason for existing. One cannot help but be in awe when he contemplates
the mysteries of eternity, of life, of the marvelous structure of
reality. It is enough if one tries merely to comprehend a little
of this mystery every day. Never lose a holy curiosity.
-- Albert Einstein