Who shall tempt with wand'ring feet The dark unbottomed infinite abyss And through the palpable obscure find out His uncouth way, or spread his aery flight Upborne with indefatigable wings Over the vast abrupt, ere he arrive The happy isle.

-Milton,John
  Beelzebub. Paradise Lost (published1667), bk.2, l.404^10.

You will see Coleridgeöhe who sits obscure In the exceeding lustre and the pure Intense irradiation of a mind, Which, through its own internal lighting blind, Flags wearily through darkness and despairö A cloud-encircled meteor of the air, A hooded eagle among blinking owlsö You will see Huntöone of those happy souls Which are the salt of the earth, and without whom This world would smell like what it isöa tomb.

-Shelley, Percy Bysshe
  'Letter to Maria Gisborne' l.202^11.

I am getting more obscure day by day.

-Thomas, Dylan Marlais
  Letter to Pamela HansfordJohnson, 9 May.