God told Moses, “I have heard the groaning of the people of Israel … and I have remembered my covenant … I am the LORD”. God’s very name indicates how certain His promises are to His children, including us. It was difficult for Israel to see at the time; their brick-making burden had just been increased as a result of Moses’ talks with Pharaoh. But God sees all and hears our prayers, just as He heard Israel’s cries, and just as He heard David’s prayers.
“Deliver me from my enemies, O my God; protect me from those who rise up against me … O my Strength, I will watch for you, for you, O God, are my fortress.” David relied on God for his daily survival, such as the time this Psalm was written, when Saul sent men to kill David. We too rely on God daily, although less obviously. This can be our prayer as well, “you, O God, are my fortress, the God who shows me steadfast love”.