# for life and godliness
"for a godly life"
# through the knowledge of him who called us
You may need to make specific that it is Peter and his readers who know God. Alternate translation: "through our knowledge of God, who called us" or "because we know God, who has called us"
# through his own glory and excellence
"by showing us his own glory and greatness" or "to share his own glory and excellence"