Positive thinking will let you do everything better than negative thinking will. 
Zig Ziglar

Put a picture of yourself as a child in view somewhere, to remind yourself to be playful. 
Alexandra Stoddard

In order to carry a positive action we must develop here a positive vision. 

Dalai Lama

People deal too much with the negative, with what is wrong. Why not try and see positive things, to just touch those things and make them bloom?

Nhat Hanh

I spent a lot of years trying to outrun or outsmart vulnerability by making things certain and definite, black and white, good and bad. My inability to lean into the discomfort of vulnerability limited the fullness of those important experiences that are wrought with uncertainty: Love, belonging, trust, joy, and creativity to name a few.

Brene Brown

All colors are the friends of their neighbors and the lovers of their opposites.

Marc Chagall

A smile is the light in your window that tells others that there is a caring, sharing person inside.

Denis Waitley