Erudition - dust shaken out of a book into an empty skull. Ambrose Bierce
An empty head is not really empty; it is stuffed with rubbish. Hence the difficulty of forcing anything into an empty head. Eric Hoffer
Business underlies everything in our national life, including our spiritual life. Witness the fact that in the Lord's Prayer, the first petition is for daily bread. No one can worship God or love his neighbor on an empty stomach. Woodrow Wilson
An empty belly hears nobody. English Proverb
An empty bag cannot stand upright. English Proverb
An empty barrel makes the most noise. English Proverb