To abound is to have a surplus, and abundance, and extravagant portion.
Should the fish in the Pacific worry that it will run out of
ocean? No. Why? The ocean abounds with water. Does the Seagull need
to be anxious about finding room in the sky to fly? No. The sky
abounds with space. Should the Christian worry that the cup of
mercy will run empty? He may. For he may not be aware of gods
abounding grace. Are you? Are you aware that the cup God gives you
overflows with Mercy? Or are you afraid your cup will run dry? Your
warranty will expire? Are you afraid your mistakes are too great
for God's grace?… God is not a miser with his
grace. Your cup maybe low on cash or clout, but it is overflowing
with Mercy.
And you can take that from Romans 5:20. The more we see our
sinfulness, the more we see God's abounding
grace.