2 Peter 1:10

σπουδάσατε. An Imperative. “A sharp and urgent form” (Moulton, Proleg. i. 173). βεβαίαν. Cf. Deissmann, B. S. pp. 105 ff. The word has a legal sense. βεβαίωσις is the legal guarantee, obtained by a buyer from a seller, to be gone back upon should any third party claim the thing. Here the readers are exhorted to produce a guarantee of their calling and election. This may be done by the cultivation of the Christian graces, Cf. Ephesians 4:1. “To walk worthily of the calling wherewith ye are called.” κλῆσιν καὶ ἐκλογὴν. What is the difference between these two? καλέω used in Gospels = “bid to a feast”. κλητοί would, therefore, imply those bidden; ἐκλεκτοί = those who have become true partakers of God's salvation. Cf. Matthew 22:14. Not all who hear the Divine Voice (κλῆσιν) progress in Christian conduct, which is the token of ἐκλογήν. οὐ μὴ πταίσητε, as a blind or shortsighted person might do.