It might interest you to know that the 1828 Noah Webster Dictionary identifies the optimist in complimentary terms, but says nothing about the pessimist. The word 'pessimist' was not in our vocabulary at that time. It's a modern 'invention' which I believe we should 'dis-invent.'

Feed your mind with the good, the clean, the pure, the powerful, and the positive

We need to understand the difference between discipline and punishment. Punishment is what you do to someone; discipline is what you do for someone.

There has never been a statue erected to honor a critic.

People do not wander around and then find themselves at the top of Mount Everest.

Don't let the mistakes and disappointments of the past control and direct your future.

Life is too short to spend your precious time trying to convince a person who wants to live in gloom and doom otherwise. Give lifting that person your best shot, but don't hang around long enough for his/her bad attitude to pull you down. Instead, surround yourself with optimistic people.