Harald Høffding,
A Brief History of Modern Philosophy
(1912)
“ The dissimilarity is greatest when we come to the last step — and here indeed the causal relation is revealed as an act of will! Will manifests itself everywhere as the will to live — for the mere sake of living, of pure existence. Here the question, why, no longer occurs; the principle of sufficient reason does not apply to the will itself. The multiplicity of forms and energies in nature, the movements which are forever renewed, and the everlasting unrest in the world reveal the presence of the ever-active energy of the impulse of self-assertion. ”
