Instinct (n.) is a vehicle of security, while intellect is the organ of an adventurous liberty.
An Instinct (n.) is apt to become a burden when the environment that needed it has disappeared.
An Instinct (n.) is an eddy in the river of life: it still belongs to the current but goes round and round while the rush continues.
Instinct (n.) is knowledge lived from within: the wasp that stings a caterpillar exactly in its nerve centres, paralysing without killing it, knows anatomy by sympathy, not by study.
An Instinct (n.) is a provisor of decisive—and usually successful—responses to stereotyped and ancestral situations; but it does not enable man to meet flexibly the fluid complexities of modern life.