When you see a person without a smile, give them yours. - Zig Ziglar

If people like you they'll listen to you, but if they trust you they'll do business with you.

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.

Much about success is just the result of simply the ability to follow up, follow through, and finish what we started.