Søren Kierkegaard said this quote

It is now my intention to draw out from the story of Abraham the dialecticalconsequences inherent in it, expressing them in the form ofproblemata, in order to seewhat a tremendous paradox faith is, a paradox which is capable of transforming amurder into a holy act well-pleasing to God, a paradox which gives Isaac back toAbraham, which no thought can master, because faith begins precisely there wherethinking leaves off.