Deuteronomy 32:18--"Of the Rock that begat thee thou art unmindful, and hast forgotten God that formed thee."
The Lord was always good to Israel. God continually shows His grace and mercy time and time again to Israel! Yet, the pattern is that even when God is good to Israel, Israel nearly always tends to forget God.
The first time the 'rock' is mentioned is when the Children of Israel are in the wilderness and they need water. God commands Moses to smite the rock and water will come out. Moses does so and it happens exactly as God says. The Lord used the rock to provide water to Israel. Yet, now Israel has forgotten the rock.
This Rock is a picture of Jesus Christ who provides living water and eternal life. God has continually provided so much for us! Yet how often are we unmindful of the Rock? How often do we forget Him and just go about our lives.
Don't forget the rock. Don't be unmindful of Him. Keep Jesus on your mind and live your life for Him!