If you want to know whether your friendship with this person (of the opposite sex) is real or hormone-induced, just ask yourself whether you would have been friends if the two of you were the same sex
Suffering of humankind is not because of not knowing what the universe is made of or how gravity works. It is because people haven't figured out their own mind. So, which knowledge is important?
Don't judge a person's greatness by his knowledge, or status, or education, or eloquence, or personality, or fan-following... The only measure of greatness is the quality of one's ideas; how useful they really are. E.g. Buddha is infinitely greater than Newtons and Einsteins