Use what little obedience you are capable of, even if it be like a grain of mustard seed. Begin where you are. Live this present moment, this present hour as you now sit in your seats, in utter, utter submission and openness toward God. Listen outwardly to these words, but within, behind the scenes, in the deeper levels of your lives where you are all alone with God the Loving Eternal One, keep up a silent prayer, “Open Thou my life. Guide my thoughts where I dare not let them go. But Thou darest. Thy will be done.” Walk on the streets and chat with your friends. But every moment behind the scenes be in prayer, offering yourselves in continuous obedience.

Source: “Holy Obedience” (lecture, 1939)

The Great Commission neither explains, nor exhausts, nor supersedes the Great Commandment.