"There is no physician like cheerful thought for dissipating the ills of the body; there is no comforter to compare with goodwill for dispersing the shadows of grief and sorrow.  To live continually in thoughts of ill will, cynicism, suspicion, and envy is to be confined in a self-made prison hole.  

But to think well of all, to be cheerful with all, to patiently learn to find the good in all - such unselfish thoughts are the very portals of heaven; and to swell day by day in thoughts of peace toward every creature will bring abounding peace to their possessor."

- James Allen