This is the mother-principle out of which demons (in the ordinary sense of the term) proceeded. At first few, as distinguished from the host of deities by exceptional harmfulness, they were multiplied with man’s growth in the classification of his world. Their principle of existence is capable of indefinite expansion, until it shall include all the realms of darkness, fear, and pain. In the names of demons, and in the fables concerning them, the struggles of man in his ages of weakness with peril, want, and death, are recorded more fully than in any inscriptions on stone. Dualism is a creed which all superficial appearances attest. Side by side the desert and the fruitful land, the sunshine and the frost, sorrow and joy, life and death, sit weaving around every life its vesture of bright and sombre threads, and Science alone can detect how each of these casts the shuttle to the other. Enemies to each other they will appear in every realm which knowledge has not mastered. There is a refrain, gathered from many ages, in William Blake’s apostrophe to the tiger:—
Tiger! tiger! burning bright
In the forests of the night;
What immortal hand or eye
Framed thy fearful symmetry?
In what distant deeps or skies
Burned that fire within thine eyes?
On what wings dared he aspire?
What the hand dared seize the fire?
When the stars threw down their spears