William De Witt Hyde,
The Five Great Philosophies of Life
“ Stoicism is fundamentally this psychological doctrine of apperception, carried over and applied in the field of the personal life,—the doctrine, namely, that no external thing alone can affect us for good or evil, until we have woven it into the texture of our mental life, painted it with the colour of our dominant mood and temper, and stamped it with the approval of our will. ”
