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.
Zig ZiglarMost of us would be upset if we were accused of being "silly." But the word "silly" comes from the old English word "selig," and its literal definition is "to be blessed, happy, healthy and prosperous."
Zig Ziglar