Institutes 2.8.39 — EXPOSITION OF THE MORAL LAW.
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**EXPOSITION OF THE MORAL LAW.**
The purport of this commandment is that since the Lord has bound the whole human race by a kind of unity, the safety of all ought to be considered as entrusted to each. In general, therefore, all violence and injustice, and every kind of harm from which our neighbour’s body suffers, is prohibited. Accordingly, we are required faithfully to do what in us lies to defend the life of our neighbour; to promote whatever tends to his tranquillity, to be vigilant in warding off harm, and, when danger comes, to assist in removing it. Remembering that the Divine Lawgiver thus speaks, consider, moreover, that he requires you to apply the same rule in regulating your mind. It were ridiculous, that he, who sees the thoughts of the heart, and has special regard to them, should train the body only to rectitude. This commandment, therefore, prohibits the murder of the heart, and requires a sincere desire to preserve our brother’s life. The hand, indeed, commits the murder, but the mind, under the influence of wrath and hatred, conceives it. How can you be angry with your brother, without passionately longing to do him harm? If you must not be angry with him, neither must you hate him, hatred being nothing but inveterate anger. However you may disguise the fact, or endeavour to escape from it by vain pretexts. Where either wrath or hatred is, there is an inclination to do mischief. If you still persist in tergiversation, the mouth of the Spirit has declared, that “whosoever hateth his brother is a murderer,” ( 1 John 3:15 ); and the mouth of our Saviour has declared, that “whosoever is angry with his brother without a cause shall be in danger of the judgment: and whosoever shall say to his brother, Raca, shall be in danger of the council: but whosoever shall say, Thou fool, shall be in danger of hell fire,” ( Mt. 5:22 ).
Source
source-manifest/institutes— Calvin, Institutes of the Christian Religion, tr. Beveridge 1845 (PD)- evidence_grade: D_doctrinal_textbook