As you sow, so shall you reap.

In English: As you sow, so shall you reap. -- One will either enjoy or suffer the consequences of his earlier actions.

Equivalent: As you make your bed so must you lie on it. -- You must accept the consequences of your act.

In German: Wie man in den Wald hineinruft, so shallt es herous. -- (Others will treat you as you treat them.)