Psalm 34:12-13

Who is the man who desires life and loves many days, that he may see good? Keep your tongue from evil and your lips from speaking deceit. Turn away from evil and do good; Seek peace and pursue it. 

With our words, we build faith and a good life, and with our words, we can tear it down. When we speak the Word of God in faith, we also need to act as if it is true, because we believe what we say. We activate spiritual forces when we act in faith on the Word of God. We plug into the power of God, just as we plug into electricity. The power of God is always there; now activate it.