Ecclesiastes 6:7
"All the labour of man is for his mouth, and yet the appetite is not filled."
Cross References (ranked by relevance)
Labour not for the meat which perisheth, but for that meat which endureth unto everlasting life, which the Son of man shall give unto you: for him hath God the Father sealed.
He that laboureth laboureth for himself; for his mouth craveth it of him.
Therefore I say unto you, Take no thought for your life, what ye shall eat, or what ye shall drink; nor yet for your body, what ye shall put on. Is not the life more than meat, and the body than raiment?
If a man beget an hundred children, and live many years, so that the days of his years be many, and his soul be not filled with good, and also that he have no burial; I say, that an untimely birth is better than he.
He that loveth silver shall not be satisfied with silver; nor he that loveth abundance with increase: this is also vanity.
And I will say to my soul, Soul, thou hast much goods laid up for many years; take thine ease, eat, drink, and be merry.