Now I come to your Temple with burnt offerings
to fulfill the vows I made to you—
14 yes, the sacred vows that I made
when I was in deep trouble.
15 That is why I am sacrificing burnt offerings to you—
the best of my rams as a pleasing aroma,
and a sacrifice of bulls and male goats. Interlude
16 Come and listen, all you who fear God,
and I will tell you what he did for me.
17 For I cried out to him for help,
praising him as I spoke.
18 If I had not confessed the sin in my heart,
the Lord would not have listened.
19 But God did listen!
He paid attention to my prayer.
20 Praise God, who did not ignore my prayer
or withdraw his unfailing love from me.
Psalm 66:13-20
What promise have you made to the Lord?
Lillie-Put 
As I was reading this scripture it was verse 16 that jumped out to me. Making a promise to God is a scary thing for me I don’t want to let him down lol.. but In answering the question I am most comfortable in promising Him verse 16. I will his people what He has done for me.
I agree. If I can just do that, that will be accomplishing something.