Persistence is required if you are going to overcome discouragement.
Persistence is vital to success because defeats, failures, mistakes, and
delays are inevitable. It doesn't make any difference how highly you
develop your skills or how knowledgeable you become in a particular field,
you are going to make mistakes and experience periods of failure from time
to time. We live in a fallen world, and there is no getting away from the
inevitability of error. The problem with failures, faults, and mistakes is
that many of us don't know how to deal with them. We allow ourselves to
become discouraged by them, even if we know we are learning valuable
lessons by experiencing them.

- Charles Stanley