Confident Salvation

Philippians 3:1-6

3 Finally, my brethren, rejoice in the Lord. To write the same things again is no trouble to me, and it is a safeguard for you.

2 Beware of the dogs, beware of the evil workers, beware of the false circumcision; 3 for we are the true circumcision, who worship in the Spirit of God and glory in Christ Jesus and put no confidence in the flesh, 4 although I myself might have confidence even in the flesh. If anyone else has a mind to put confidence in the flesh, I far more: 5 circumcised the eighth day, of the nation of Israel, of the tribe of Benjamin, a Hebrew of Hebrews; as to the Law, a Pharisee; 6 as to zeal, a persecutor of the church; as to the righteousness which is in the Law, found blameless.
NASU

Action: What should I put my confidence in for my salvation?