Romans 5:5

This hope, the focal point of this pericope, will not suffer disappointment, because God loves us and enables us to withstand tribulations. He does this by His Holy Spirit whom He has given to indwell every justified sinner in the church age (cf. Acts 2:33; Romans 8:9). Paul developed the Holy Spirit’s ministry to the believer later (ch. 8). The fifth benefit of justification therefore is the indwelling Holy Spirit. Note the progression in these verses from faith (Romans 5:1) to hope (Romans 5:2-5) to love (Romans 5:5; cf. 1 Corinthians 13:13).

"The confidence we have for the day of judgment is not based only on our intellectual recognition of the fact of God’s love, or even only on the demonstration of God’s love on the cross (although that is important; cf. Romans 5:6-8), but also on the inner, subjective certainty that God does love us." [Note: Moo, p. 304.]