All there is to thinking
Norman Maclean in A River Runs Through It, quoted by Frederick Goodman in Algebra – Abstract and Concrete, Ed 2.6, SemiSimple Press
is seeing something noticeable
which makes you see something you weren’t noticing
which makes you see something that isn’t even visible.
I can’t praise enough Goodman’s book which you can find here, in case you’re interested in (introductory pure) mathematics.
Now, since
faith is the evidence of things not seen
excerpt from Hebrews 11:1 KJV
we can conclude that all there is to thinking is the knowledge of faith.