A good servant follows master's instructions completely without applying any changes from his own side.
This in turn gets him promotion & long service tenure.
Servant is the doer but is merely following instructions....he can not say, I've done it when all he did was follow instructions.
Similarly, if we act without ego, our body does good things by following instructions of our conscience/god.......we(ego) can't say I did it.
We can only lay claim to ego based wrong decisions which is similar to a servant not following master's instructions.