"Do not give your attention to what others do or fail to do; give it to what you do or fail to do." 

-Dhammapada

"Happiness is like a butterfly; the more you chase it, the more it will elude you. But if you turn your attention to other things, it will come and sit softly on your shoulder." 

-Henry David Thoreau

“The most precious gift we can offer anyone is our attention. When mindfulness embraces those we love, they will bloom like flowers.”
-Thich Nhat Hanh

"Pay no attention to the faults of others, things done or left undone by others. Consider only what by oneself is done or left undone."
-Buddha