I love this prayer written by St. Anthony, and use it often, when I seem at a loss for words of my own:
Lord, I am not worthy of You. I am unworthy of serving You, yet I trust in You alone. I implore You to watch over me and walk beside me. Keep Your mouth close to my ear and guide me with Your hand like a father helps his child in his first steps.
I will be the water for Your fields, the light for Your seed, the servant who cleans Your stable, the mouth which speaks Your words, the ear which listens to Your children, the legs which cover the distance and the heart which understands the heart. Take me with you, Lord, and do not abandon me ever. Amen.