Give someone a smile today.

It is a greater thing to give someone a smile then a glass of milk.  One of the most important ways to grow spiritually is to feel good about yourself. When a person feels good about themselves they have confidence that they can grow.  By helping another person to feel good about them self we are helping them to grow.

from a Shiur by Rabbi Orlowek, "Stategies of the Yetzer Harah"