The actions of God's grace are also usually presented as mediated by the Holy Spirit.
Has given to us: we did not acquire or obtain it by our own efforts. It has been given to us freely.
For life and piety: not bodily life, but spiritual life. This is clear from its being joined with the word piety, which signifies spiritual perfection.
Through the knowledge of Him who called us; cf. 1 Pet 1:15; 1 Pet 2:9. The divine calling is the fulfillment in time of God's election of man, accomplished before time (Rom 8:29-30).
The aim of the calling is not specified here. Where nothing definite is mentioned about such a calling, as for example in 1 Pet 2:21 and 1 Pet 3:9, the general aim is usually supplied: eternal blessedness and glory; cf. 1 Pet 5:10; 1 Thess 2:12; 1 Tim 6:12.
By glory and goodness: the holy apostle Peter often uses the word glory, and sometimes connects it with the word power (1 Pet 4:1; 1 Pet 5:11). Here he connects it with the word goodness.
Concerning the concept of glory in the present passage, see the explanation in the note to 1 Pet 1:7. It is more difficult to explain the juxtaposition of the concepts glory and goodness.
That they do not signify one and the same concept is clear from the connection of the discourse in verse 4, by the word by which. The two concepts cannot be combined as glorious goodness.
The Greek word translated as goodness originally means courage or strength. Accordingly, the whole expression glory and goodness should be translated and interpreted in context as follows.
God calls man into His Kingdom by His glorious, wondrous, rich, and lofty grace, worthy of His most high name. He also calls by power, by a strong drawing or attraction.
This accords with the Lord's own words that God draws man to Him, as though compelling him by force (Jn 6:44; cf. 1 Pet 2:9).