Romans 5:1-3 (New International Version)

1Therefore, since we have been justified through faith, we have peace with God through our Lord Jesus Christ, 2through whom we have gained access by faith into this grace in which we now stand. And we rejoice in the hope of the glory of God. 3Not only so, but we also rejoice in our sufferings, because we know that suffering produces perseverance;

1 Corinthians 2:4-5 (New International Version)

4My message and my preaching were not with wise and persuasive words, but with a demonstration of the Spirit's power, 5so that your faith might not rest on men's wisdom, but on God's power.