My message and my preaching were not with wise and persuasive words, but with a demonstration of the Spirit's power, so that your faith might not rest on men's wisdom, but on God's power.
1 Corinthians 2:4-5 (NIV)
Now to Him who is able to do immeasurably more than all we ask or imagine, according to the power that is at work within us, to Him be glory in the church and in Christ Jesus throughout all generations, for ever and ever. Amen.
Ephesians 3:20-21 (NIV)
For God did not give us a spirit of timidity, but a spirit of power, of love, and of self-discipline.
2 Timothy 1:7 (NIV)