I met a man a couple of years ago who had grown up with a huge amount of money. And he said to me in passing, “You know, money is not the most important thing.” Which is both true, and profoundly ignorant. Because when you have no money, it is absolutely the most important thing. Only someone who has never had to worry can make a statement like that.
Was Snape a hero? J.K Rowling’s answer:

I don’t see him really as a hero. He’s spiteful, he’s a bully, all these things are still true of Snape even at the end of these books.” - J.K Rowling.

Because I’ve seen so much hate flowing towards her about the “she redeemed Snape even though he was a bully,” I thought I’d clear the air. She said this in an interview, and here’s the link. Just because Harry was grateful that Snape saved him a couple of times, and helped him find the sword of Gryffindor, doesn’t mean J.K Rowling sought to portray him as a hero. I hope this helped clear the air. 

Know Thyself. It’s good advice. Know yourself. You are worth knowing. Examine your life. The unexamined life is not worth living. Be aware that other people have equal significance. Give them the space to make their own choices, and let their choices count as you want them to let your choices count. Remember that excellence has no stopping point and keep on pursuing it. Make art that can last and that says something nobody else can say. Live the best life you can, and become the best self you can. You cannot know which of your actions is the lever that will move worlds.
—  Jo Walton, The Just City