passion

What is the meaning of the verse: "Modah ani lefanekha, King who lives and endures, for You have returned my soul to me in compassion; abundant is Your faithfulness"? Why "abundant is Your faithfulnes...

I heard that "one who has no understanding may not be shown mercy." But what is such a poor person supposed to do if the Creator of the world did not grant him understanding?! Thank you very much!!!!