“In the most secret chamber of the spirit of him who believes himself convinced that death puts an end to his personal consciousness, his memory, for ever, and all unknown to him perhaps, there lurks a shadow, a vague shadow, a shadow of uncertainty”
The Tragic Sense of Life (1913), VI : In the Depths of the Abyss
Context: In the most secret chamber of the spirit of him who believes himself convinced that death puts an end to his personal consciousness, his memory, for ever, and all unknown to him perhaps, there lurks a shadow, a vague shadow, a shadow of uncertainty, and while he says within himself, "Well, let us live this life that passes away, for there is no other!" the silence of this secret chamber speaks to him and murmurs, "Who knows!... " These voices are like the humming of a mosquito when the south-west wind roars through the trees in the wood; we cannot distinguish this faint humming, yet nevertheless, merged in the clamor of the storm, it reaches the ear.
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Miguel de Unamuno 199
19th-20th century Spanish writer and philosopher 1864–1936Related quotes

“The most dangerous kind of person… is one who is afraid of his own shadow.”
Source: A Scanner Darkly

“Behold him setting in his western skies,
The shadows lengthening as the vapours rise.”
Pt. I line 268.
Absalom and Achitophel (1681)

As quoted in "Lincoln's Imagination" by Noah Brooks, in Scribner's Monthly (August 1879), p. 586 http://books.google.com/books?id=jOoGAQAAIAAJ&pg=PA586
Posthumous attributions
Variant: Character is like a tree and reputation like a shadow. The shadow is what we think of it; the tree is the real thing.

“Night, the shadow of light,
And Life, the shadow of death.”
Second chorus, lines 1-12.
Atalanta in Calydon (1865)
Context: Before the beginning of years
There came to the making of man
Time with a gift of tears,
Grief with a glass that ran,
Pleasure with pain for leaven,
Summer with flowers that fell,
Remembrance fallen from heaven,
And Madness risen from hell,
Strength without hands to smite,
Love that endures for a breath;
Night, the shadow of light,
And Life, the shadow of death.