Romans 8:24

γὰρ. These clauses explain the στενάζομεν … ἀπεκδεχόμενοι.

τῇ γὰρ ἐλπίδι. “Hope gives a definite shape to the absolute confidence of faith. Faith reposes completely on the love of GOD. Hope vividly anticipates that GOD will fulfil His promise in a particular way” Westcott, Hebrews 10:23; cf. Hort, 1 Pet. p. 86; cf. Galatians 5:5; Ephesians 1:18; Ephesians 4:4; Colossians 1:27; 1 Thessalonians 5:8. For the connexion with ἐσώθημεν, 1 Peter 1:3 (with Hort’s note (p. 34), “The new order of things is represented as in a manner all one great, all-pervading hope”).

The article = this hope, namely of the redemption of the body; cf. Romans 7:25. The dative can hardly mean ‘by this hope’ but ‘in this hope’; cf. S. H. Salvation, as ἀπολύρωσις and υἱοθεσία, is a process, and it begins with faith, on man’s part, and is carried on in an atmosphere or condition of hope, the hope of complete redemption.

ἐλπὶς δὲ. Hope implies a fulfilment still future, and that demands the expectancy of a steady endurance.