God’s continued rescuing of David from Saul show that God always reserves a remnant of his people and ultimately saves his anointed one from death.
God has always been with his people, in various ways and temporarily in Old Testament times and later and permanently in human flesh.
In the thanksgiving section of Paul’s letter to the Colossians, he recognized their faith and love, which were based on their certain hope.
No matter how long we have been Christians, we can always keep growing more and more in purity and love.