1 Samuel 12:24 Only fear the Lord, and serve him in truth with your heart: for consider how great things he hath done for you.
In Samuel’s address to the people upon anointing their new king, he urges them to remain faithful to the Lord by fearing and serving Him in truth with the heart. Trust and worship the Lord your God and serve Him only. The outcome of such faithful worship will be blessing and good. Unfaithfulness in serving other gods will result in curses and bad things.
The key to continued fearing and serving is to consider often what a great God you have and what great things He has done for you. When we take time to consider on a regular basis the great things God has done for us we are most likely to fear (believe) Him and serve (worship) Him, and then enjoy the consequent blessings. For us it is a question of considering and rehearing and remembering the great work of Jesus Christ in His death and resurrection. We do just this when we go to church weekly to hear the Gospel and remember our Baptism daily.
Considering involves hearing, learning, reminding, and taking to heart the Word of Gospel, how great and good Jesus really is for us. Consider what great things Christ has done for us. It is too easy to forget amid the daily grind of living in the world. So stop and consider.