As soon as man does not take his existence for granted,
but beholds it as something
unfathomably mysterious, thought begins.
- Albert Schweitzer

Be thankful that life is a mystery.
There is so much we can never know.
Breathe deeply and relax into the not-knowing.
There is much that we do not have to know in order to live joyfully.
- Jonathan Lockwood Huie

Uncertainty that comes from knowledge
(knowing what you don't know)
is different from uncertainty coming from ignorance.
- Isaac Asimov

Mystery creates wonder,
and wonder is the basis of man's desire to understand.
- Neil Armstrong

Further reading: Nothing is Certain

Cherish Mystery

Childlike Wonder

Magnificent Mystery