New Defender's Study Bible Notes
3:20 able. This is one of several great ascriptions in the New Testament extolling the supreme ability of God on behalf of His people. He also “is able to save them to the uttermost that come unto God by Him” (Hebrews 7:25) and “able to keep you from falling, and to present you faultless before the presence of His glory with exceeding joy” (Jude 24). Note also Romans 16:25; Philippians 3:21.
3:20 power. The “power” in us is not that of our own strength, of course, but the power of the indwelling Holy Spirit (Acts 1:8, II Timothy 1:7).