A.J. Liebling (1904-1963), Between Meals: An Appetite for Paris
(New York: North Point Press, 1986), p. 108:
I use the verb "to eat" here to denote a selective activity, as opposed to the passive acceptance and regular renewal of nourishment, learned in infancy. An automobile receiving fuel at a filling station or an infant at the breast cannot be said to eat, nor can a number of people at any time in their lives.
Id., p. 113:
The eater's apprenticeship, though less arduous, must be as earnest as the cook's.