On the form of expression, see on 1Jo 1:5. For the thought, compare Joh 15:7.
We keep (τηροῦμεν)
See on 1Pe 1:5. Note the combination of keep and do. Watchful discernment and habitual practice. Compare Psa 123:2. The same combination occurs 1Jo 5:2, 1Jo 5:3, where instead of the first τηρῶμεν keep, read ποιῶμεν do.
Pleasing (ἀρεστά)
See Joh 8:29.
In His sight (ἐνώπιον αὐτοῦ)
Compare ἕμπροσθεν αὐτοῦ before Him, or in His presence (1Jo 3:19). In His sight “accentuates the thought of the divine regard. Compare Joh 7:37 and Joh 20:30” (Westcott).