You can't have your cake and eat it too
The things people want are often incompatible. This proverb is easier to grasp if it is understood to mean “You can't eat your cake and have it too.”
The New Dictionary of Cultural Literacy, Third Edition Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.