Or ministry, let us wait on our ministering: or he that teaches, on teaching;
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The minister is strengthened for the service of the church to the extent that he believes he ought to serve, lest he labor beyond his faith and exhaust himself in serving to his ruin…. Likewise Paul says that the teacher is aided in his teaching so that he will be inspired to transmit the divine doctrine to the extent that he has the faith to teach. Commentary on Paul’s Epistles.
The word service is comprehensive, covering everything from the apostleship itself to any spiritual function. It is indeed the name of a particular office [viz., the diaconate], but here it is used in a general sense.