Silence, reflection, hearing the Word of God, and understanding; Augustine instructs us in all of these in Sermon 52, 22.
“Let us leave a little room for reflection in our lives, room too for silence. Let us look within ourselves and see whether there is some delightful hidden place inside where we can be free of noise and argument. Let us hear the Word of God in stillness and perhaps we will then come to understand it.”— Augustine, bishop of Hippo Regius, in the Roman province of Africa: present-day Annaba, Algeria; 354-430 Common Era.