Good deeds, like light bulbs, need electricity.

Good deeds, like limbs of a living body, need life.

Good deeds, like a human being, require a mind and a heart.

A good deed has to connect you to your source above. If it is connected, it glows with life.

Torat Menachem, vol. 34 (Likkutei Sichot, vol. 4), Parshat Korach.