The Fly and the Penny
The Gerer rabbi said: "Many of us possess less fear of a transgression than of a fly.? When a fly alights upon us, we take the trouble to brush it away. Likewise, many of us possess less willingness to perform a comandment than to obtain a small coin. if we see a small coin on the ground, we take the trouble to bend down and pick it up."
Source: Siach Sarfei Kodesh