My opinion is that one should always try his best. Then he will achieve the most he can. We took that approach raising our daughter. She was never told that her very best would get her the topmost grades in school. She was told that we required her report cards to indicate that the teacher’s opinion was that she was always behaving properly and doing the best she could. She got some B grades, not all A grades, but she was never stressed out like her friends whose parents demanded certain grades. And she earned a full college scholarship, and graduated college cum laude.

If you always do the right thing and make your best effort you will be rewarded with mostly success and can’t be blamed for your few failures — but you will have some failures.