By William James:

“In human life, although we only see our world, yet encompassing it a
still wider world may be there; and to believe in that world may be the
most essential function that our lives in this world have to perform.
The “scientific” life itself has much to do with maybes, and human life
at large has everything to do with them. Not a victory is gained, not a
deed of faithfulness or courage is done, except upon a maybe; not a
service, not a sally of generosity, not a scientific exploration or
experiment or textbook, that may not be a mistake. It is only by
risking our persons from one hour to another that we live at all. And
often enough our faith beforehand in an uncertified result is the only
thing that makes the result come true.”

We must risk if we are to live at all.