When you know from experience, others will recognize it, and they will know to ask the right questions. And, as busy as you might be, you will stop and give them the right answers. Their intention pulls it from you. Also, you'll be an even nicer person. On the contrary, it makes them, for the most part, humble, tolerant and kind.
Failure makes people bitter and cruel.
We are here on earth to do good to others. What the others are here for, I don't know. One gives of what one has. The place to be happy is here. The time to be happy is now.