10 so that you may be able to discern what is best and may be pure and blameless for the day of Christ,

Read Philippians 1:10 Using Other Translations

That ye may approve things that are excellent; that ye may be sincere and without offence till the day of Christ;
so that you may approve what is excellent, and so be pure and blameless for the day of Christ,
For I want you to understand what really matters, so that you may live pure and blameless lives until the day of Christ’s return.