If you fail, never give up because FAIL means, first Attempt In Learning. End is not the end, if fact END means, Effort Never Dies. If you get No as an answer, remember NO means, Next Opportunity. So Let's be positive.
Encouragement: If a kid gets an answer right, tell him it was a lucky guess. That way, he develops a good, lucky feeling.
If you believe it will work out, you'll see opportunities. If you believe it won't you will see obstacles.