"12For the word of God is quick, and powerful, and sharper than any twoedged sword, piercing even to the dividing asunder of soul and spirit, and of the joints and marrow, and is a discerner of the thoughts and intents of the heart. 13Neither is there any creature that is not manifest in his sight: but all things are naked and opened unto the eyes of him with whom we have to do. " (Hebrews 4:12,13)
"So shall my word be that goeth forth out of my mouth: it shall not return unto me void, but it shall accomplish that which I please, and it shall prosper in the thing whereto I sent it." (Isaiah 55:11)
You can hear Darrell Waltrip's speech in which he shared the Gospel at the National Prayer Breakfast in this video.