And patience, experience; and experience, hope:

People's New Testament

5:4 Experience, hope. The sense of the divine approval fills the soul with hope.

Wesley's Notes

5:4 And patience works more experience of the sincerity of our grace, and of God's power and faithfulness.

Jamieson-Fausset-Brown Bible Commentary

4. patience worketh experience-rather, "proof," as the same word is rendered in 2Co 2:9; 13:3; Php 2:22; that is, experimental evidence that we have "believed through grace."

and experience-"proof."

hope-"of the glory of God," as prepared for us. Thus have we hope in two distinct ways, and at two successive stages of the Christian life: first, immediately on believing, along with the sense of peace and abiding access to God (Ro 5:1); next, after the reality of this faith has been "proved," particularly by the patient endurance of trials sent to test it. We first get it by looking away from ourselves to the Lamb of God; next by looking into or upon ourselves as transformed by that "looking unto Jesus." In the one case, the mind acts (as they say) objectively; in the other, subjectively. The one is (as divines say) the assurance of faith; the other, the assurance of sense.

Matthew Henry's Concise Commentary

5:1-5 A blessed change takes place in the sinner's state, when he becomes a true believer, whatever he has been. Being justified by faith he has peace with God. The holy, righteous God, cannot be at peace with a sinner, while under the guilt of sin. Justification takes away the guilt, and so makes way for peace. This is through our Lord Jesus Christ; through him as the great Peace-maker, the Mediator between God and man. The saints' happy state is a state of grace. Into this grace we are brought, which teaches that we were not born in this state. We could not have got into it of ourselves, but we are led into it, as pardoned offenders. Therein we stand, a posture that denotes perseverance; we stand firm and safe, upheld by the power of the enemy. And those who have hope for the glory of God hereafter, have enough to rejoice in now. Tribulation worketh patience, not in and of itself, but the powerful grace of God working in and with the tribulation. Patient sufferers have most of the Divine consolations, which abound as afflictions abound. It works needful experience of ourselves. This hope will not disappoint, because it is sealed with the Holy Spirit as a Spirit of love. It is the gracious work of the blessed Spirit to shed abroad the love of God in the hearts of all the saints. A right sense of God's love to us, will make us not ashamed, either of our hope, or of our sufferings for him.