John Calvin Commentary Romans 13:10

"Love worketh no ill to his neighbor: love therefore is the fulfilment of the law." — Romans 13:10 (ASV)

Love does no evil to a neighbor, etc. He demonstrates by the effect that under the word "love" are contained those things which are taught us in all the commandments; for he who is endowed with true love will never entertain the thought of injuring others. What else does the whole law forbid, other than that we do no harm to our neighbor?

This, however, ought to be applied to the present subject; for since magistrates are the guardians of peace and justice, he who desires that his own right should be secured for everyone, and that all may live free from wrong, ought to defend, as far as he can, the power of magistrates.

But the enemies of government show a disposition to do harm. And when he repeats that the fulfilling of the law is love, understand this, as before, as applying to that part of the law which refers to mankind; for the first table of the law, which contains what we owe to God, is not here referred to at all.