"God is a challenge because there is no proof of his existence and therefore the search must continue"

This quote by Donald Knuth talks to the difficulty of thinking in God. With no tangible proof of God's existence, it can be difficult to have faith in something that can not be seen or touched. Knuth suggests that this obstacle is something that needs to be accepted which the search for evidence of God's existence should continue. This quote implies that faith in God is something that needs to be actively pursued and that it is not something that can be considered given. It likewise suggests that the look for evidence of God's presence is an ongoing procedure and that it is something that must not be deserted. Ultimately, this quote encourages us to keep looking for proof of God's existence and to never ever give up hope.