A heavier task could not have been imposed,
Than I to speak my griefs unspeakable. [ William Shakespeare ]

Health - the silliest word in our language, and one knows the popular idea of health. The English country gentleman galloping after a fox - the unspeakable in full pursuit of the uneatable. [ Oscar Wilde, A Woman of No Importance ]

Of God's light I was not utterly bereft, if my as yet sealed eyes, with their unspeakable longing, could nowhere see Him; nevertheless in my heart He was present and His heaven-written law still stood legible and sacred there. [ Carlyle ]

There is a sacredness in tears. They are not the mark of weakness, but of power. They speak more eloquently than ten thousand tongues. They are the messengers of overwhelming grief, of deep contrition, and of unspeakable love. [ Washington Irving ]

Wherever there is a sky above him and a world around him, the poet is in his place; for here too is man's existence, with its infinite longings and small acquirings; its ever-thwarted, ever-renewed endeavours; its unspeakable aspirations, its fears and hopes that wander through eternity; and all the mystery of brightness and of gloom that it was ever made of, in any age or climate, since man first began to live. [ Carlyle ]