Палка о двух концах

The result of an action can have both good and bad consequences

Cf: It cuts both ways (Am., Br.). The same heat that melts the wax will harden the clay (Br.). The same knife cuts both bread and fingers (Br.). The same sunshine that will melt butter will harden the clay (Br.). The same sun that will melt butter will harden clay (Am.). When you pick up a stick at one end, you also pick up the other end (Am.)