William reads Philippians 3 v1-7, which emphasize that salvation depends on our inward relationship with Christ, not our outward acts of religion.

Philippians 3:1–7

Righteousness Through Faith in Christ

3:1 Finally, my brothers,¹ rejoice in the Lord. To write the same things to you is no trouble to me and is safe for you.

2 Look out for the dogs, look out for the evildoers, look out for those who mutilate the flesh. 3 For we are the circumcision, who worship by the Spirit of God² and glory in Christ Jesus and put no confidence in the flesh—4 though I myself have reason for confidence in the flesh also. If anyone else thinks he has reason for confidence in the flesh, I have more: 5 circumcised on the eighth day, of the people 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 righteousness under the law,³ blameless. 7 But whatever gain I had, I counted as loss for the sake of Christ.

Footnotes

[1] 3:1 Or brothers and sisters; also verses 13, 17
[2] 3:3 Some manuscripts God in spirit
[3] 3:6 Greek in the law

(ESV)