Although there are various options, here is what I would write if I were in your position:
Learning tends to have a positive effect on a person's life in that (1) by learning, one gains a sharper sense of what one does not know and is so able to ask more pertinent questions and (2) by learning one gains insight into diverse perspectives, and thus the ability to reframe problems and possibly gain fresh insight into these problems.
This is probably because most people don't really care about why you're sending the email. They just to know what you'd like or what question you have. That's just my guess.
