If it is a mere absence of sound, why is it so delicious? Turn off some noisemaker and the silence is there, palpably. It is supereminently there if you succeed in turning off that most noisy and hard-to-turn-off noisemaker, your own mind.
Max Picard proved unhelpful. His effusions are vaguely suggestive but neither fish nor fowl, neither philosophy nor poetry. More help is to be had from the Beatles: "Turn off your mind, relax, and float downstream. It is not dying, it is not dying . . . ."