2Tim. 1.3
Thank God .. that he remembered to pray for Timothy (perhaps Timothy had requested it, or that Onsiphorius had told him some things about Timothy 2 Timothy 1:16-17)
Forefathers - Paul claims a pious ancestry as in Acts 24:14; Acts 26:5; Galatians 2:14; Phi 3:4-7.
Robertson's Word Pictures
Phi 3:5. He means, in the spirit and with the principles inherited from his fathers. Comp. the sharp distinction between the two periods of Paul's life, Galatians 1:13, Galatians 1:14. Vincent's Word Studies
Back of Paul's mind is the fact the Christianity is not a new, upstart faith, but the culmination of a historical, legitimate faith and the divinely ordained sequel to Judaism.(Coffman)
Paul was not guilty of propagating some illegal religion in the name of a strange deity, as often accused.
Pure conscience .. always, 1st as a persecutor, now in proclaiming Jesus.