I have always enjoyed the thought that a tip can light up someone else's day and maybe even turn it around.

Generosity can be contagious in a healthy way. . . . Being generous creates an atmosphere that is more sacred, a sense that the world blesses us in unexpected ways, often in ways we obviously don't deserve.

David Steindl-Rast in Music of Silence by David Steindl-Rast, Sharon Lebell