How to be attentive?

“What is to be attentive? (…) Attention involves seeing and hearing. We hear not only with our ears but we are sensitive to the tones, the voice, to the implication of words, to hear without interference, to capture instantly the depth of a sound. Sound plays an extraordinary part in our lives: the sound of thunder, a flute playing in the distance, the unheard sound of one’s own heart beating,