Römer 15:4

For whatsoever things were written aforetime were written for our learning--"instruction" through, &c.--"through the comfort and the patience of the Scriptures" might have hope--that is, "Think not that because such portions of Scripture relate immediately to Christ, they are inapplicable to you; for though Christ's sufferings, as a Saviour, were exclusively His own, the motives that prompted them, the spirit in which they were endured, and the general principle involved in His whole work--self-sacrifice for the good of others--furnish our most perfect and beautiful model; and so all Scripture relating to these is for our instruction; and since the duty of forbearance, the strong with the weak, requires 'patience,' and this again needs 'comfort,' all those Scriptures which tell of patience and consolation, particularly of the patience of Christ, and of the consolation which sustained Him under it, are our appointed and appropriate nutriment, ministering to us 'hope' of that blessed day when these shall no more be needed." See on Rom 4:7, Note 7. (For the same connection between "patience and hope" see on Rom 12:12, and Th1 1:3).

The apostle, in this chapter, continues the discourse of the former, concerning mutual forbearance in indifferent things; and so draws towards a conclusion of the epistle. Where such differences of apprehension, and consequently distances of affection, are among Christians, there is need of precept upon precept, line upon line, to allay the heat, and to beget a better temper. The apostle, being desirous to drive the nail home, as a nail in a sure place, follows his blow, unwilling to leave the subject till he has some hopes of prevailing, to which end he orders the cause before them and fills his mouth with the most pressing arguments. We may observe, in this chapter, I. His precepts to them. II. His prayers for them. III. His apology for writing to them. IV. His account of himself and his own affairs. V. His declaration of his purpose to come and see them. VI. His desire of a share in their prayers.

15:4 Such things were written in the Scriptures long ago to teach us: All that God caused to be recorded in the Old Testament has supreme relevance to believers, who experience the fulfillment of God’s plan.