Timothy the Child in the Faith of Paul

Paul sent this letter to Timothy who he called "his child in the
faith" to encourage him and to give him orders. And Timothy is not the
only one who was called "child in faith" by Paul but some other
apostles were also called his child in faith or his beloved child. So
what is the importance of this "father son" relationship between Paul
and Timothy in this letter and other stories in the Bible? What do we
have to learn from this relationship?

One of the purposes that Paul sent this letter to his beloved child in
faith Timothy is to give him orders (1:18). And the orders that he
gave him was to "wage the good warfare" by holding faith. Because , in
the time that Paul wrote this letter, both Paul, Timothy and the other
christians were being persecuted for the sake of the Gospel. So Paul
had to send this letter to encourage them in the battle for keeping
their faith. Paul continued to encouraged them in 2 Timothy also and
wrote to Timothy "to be strengthened by the grace" in Christ (2
Timothy 2:1).

"You then, my child, be strengthened by the grace that is in Christ Jesus..."
- 2 Timothy 2:1