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.

Quote by Zig Ziglar

Nashville: Oliver Nelson.
Ziglar Zig; Ziglar Tom (2012). (2001).

Hilary Hinton "Zig" Ziglar (November 6 1926 – November 28 2012) was an American author salesman and motivational speaker.