Why is diligent remembrance important for Christians?

In Philippians 3:1, the Apostle Paul mentions that writing the same truths is not grievous to him, indicating its importance for the believers. Repetition in teaching aids in solidifying knowledge and understanding of the faith, making Christians more certain and strong against doubts and trials. This calls to mind the human tendency to forget essential truths, and thus believers are exhorted to diligently remember and actively reflect on God's Word and His past mercies to foster a steadfast faith.