You can literally force yourself to be courteous, happy and enthusiastic with every person you meet. After you have forced yourself to be so for a short period of time... the habit takes over.
Zig ZiglarIt 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.'
Zig Ziglar