All true, there are so many great moments when you learn to fly, and I've had a few already : 1st solo, QXC, 1st solo XC, first view of the white cliffs of Dover coming back over the channel etc etc.
But for me, the best things are often simply the emotions experienced by people I take flying : usually ranges through trepidation, growing confidence, amzement, delight and then if I'm really lucky, beaming grins to shame a lighthouse ;-)
Whatever happens in life, we're lucky people to be able to give a gift like that - and receive the rewards !
FF