As you sow, so shall you reap...by Rumi

Beware Don't say, 
"Mind you, so and so sowed seed,
and then the locusts devoured it;

why should I bother sowing with such a risk?
Why should I let go of this corn-seed in my hand?"

Meanwhile, to your bewilderment,
one who did sow and labor
fills his barn with grain.

Since the lover patiently
continued knocking at the door,
at last one day
he gained an intimate meeting.

~ Rumi
Mathnawi III: 4800-4803
Version by Camille and Kabir Helminski
"Rumi: Jewels of Remembrance"
Threshold Books, 1996