Follow after peace (ειρηνην διωκετε). Give peace a chase as if in a hunt.

With all men (μετα παντων). Like Paul's use of διωκω with ειρηνην in Romans 14:19 and his to εξ υμων (so far as proceeds from you) in Hebrews 12:18. This lesson the whole world needs including Christians.

Sanctification (αγιασμον). Consecration as in 1. Thessalonians 4:7; Romans 6:19, etc.

Without which (ου χωρις). Ablative case of the relative with χωρις (post positive here). About seeing God compare Matthew 5:8 where we have καθαρο.