Hector Charles Cameron, The Nervous Child
“ A caged animal is a creature deprived of the stimulus of environment, and bereft therefore to a great extent of the skill which we call instinct, by which it procures its food, guarantees its safety from attack, constructs its home, cares for its young, and procreates its species. If, metaphorically speaking, we encircle the child with a cage, if we constantly intervene to interpose something between him and the stimulus of his environment, his characteristic powers are kept in abeyance or retarded, just as the marvellous instinct of the wild animals becomes less efficient in captivity. ”
