Though they which are once really engrafted into Christ shall certainly "be kept by the power of God through faith unto salvation," 1 Pet.l:5; yet ought they to "beware, lest being led away with the error of the wicked they fall from their own steadfastness," 2 Pet.3:17. They ought therefore to seek continual support from God. Yea they ought to seek at God's hand (in prayer, and in the right use and study of His Word, and in the right use of His ordinances) not only continuance, but also growth in grace, 2 Pet.3:18. First, because this is God's command. Secondly, because God who will establish them, will do it in this way; viz., giving them grace to be obedient to this His command, and blessing them in this obedience.