Discernment

"The work and business of the prophets and Divine Messengers is beyond the skies and the stars.
Whatsoever the sun of God's grace shines upon, whether it be a dog or a horse, that being is endowed with the glory of Divine protection.
Yet deem not the radiance of God's grace to be uniform: it has given a distinctive character to the pebble and the ruby.
From that radiance the ruby has a borrowed treasure, while the pebble has only heat and brightness.
The radiance of the sun falling on a wall is not the same as when the sun is reflected upon the water in shimmering movement...
At this time, when you are healthy and well fed, you are giving up the Truth for a phantom.
You are constantly selling the pearls from the spiritual mine, and taking walnuts in exchange, like a child."

Rumi (Vol.6, 3447-3466)

Commentary: Walnuts and pearls have a different value. Walnuts are tasty and provide immediate satisfaction. Nevertheless, Rumi urges us to collect pearls and rubies.