Paul portrays salvation as a series of divine initiatives snowballing toward fullness. He links these initiatives so tightly that each is born of the former and bears a promise of the one which follows. Glorification is thus the finishing touch on the indivisible divine work of salvation which originated in God’s foreknowledge and predestination of Christians and has come to historical expression in their calling and justification. These verses truly do form a ‘chain’ of interconnected divine salvific works and so imply a continuity in Christians’ salvation
Judith Gundry Volf
From the book “Paul and Perserverance: Staying In and Falling Away”