There is a great difference in reactions of people when they are indebted to another person.
Some people pretend not to know him who gave his help to them though he is in difficulties.
Some people tend to repay to their debtors just as much as they received. On the other hand, some try to return their love throughout their lives to anyone who helped them before.
This is the same case with the attitude toward God. Grateful people try their best to return their utmost love to God who gave them the grace of salvation. And they try to give thanks and love to God. As a result, they will flourish in the grace and blessing of God.
"Praise the LORD, O my soul, and forget not all his benefits." (Psalms 103:2)