English Proverbs: 'You Can't Have Your Cake and Eat It'
This popular English proverb means you can't enjoy two desirable but mutually exclusive things. Essentially, you can't get two incompatible benefits at the same time.
For example, you can't spend all your money frivolously and still expect to have a large savings account. You can't skip all your workouts and still expect to be in peak physical condition. It's about making choices because you often have to sacrifice one thing to gain another.