For this reason, Avraham was afraid. He made a calculation based on what he received from Hashem versus what he had given in return, and he came out only slightly ahead. “Now that Hashem has wrought this great miracle for me,” he thought, “what possible reward do I have left? Surely it has been all used up, and there is nothing left for me in the World to Come.”
Avraham Avinu wasn’t out of touch with reality. Quite the opposite. He was highly attuned to a part of the calculation we rarely think about; namely, that we are not entitled to anything. Hashem didn’t have to create us. Hashem isn’t obligated to shower us with good. Everything Hashem gives us is because He wants to share His good with us. Because of this, we owe a debt to Hashem that can never be repaid.
This perspective should be a major driving force in our serving Hashem, prompting us to attempt as much as we can to pay back the astounding good that He constantly bestows upon us.