Our perception is extremely limited. Dark matter is potentially 85-90% of the entire universe, yet we have no idea what it actually is since we can’t observe it. So if our perceived reality consists of 10-15% of all matter and we are limited in our understanding of even that 10-15% as well.. what do we truly know? Not much.
Therefore, a rational mind may be a hindrance into understanding our place in the universe, if there is one. The only way to seek mysterious universal truths would be to use what others would refer to as irrational thoughts.