Matthew 5:7 - Joseph Benson’s Commentary on the Old and New Testaments

Blessed [or happy] are the merciful The tender-hearted, compassionate, kind, and beneficent, who, being inwardly affected with the infirmities, necessities, and miseries of their fellow-creatures, and feeling them as their own, with tender sympathy endeavour, as they have ability, to relieve them; and who, not confining their efforts to the communicating of temporal relief to the needy and wretched, labour also to do spiritual good; to enlighten the darkness of men's minds, heal the disorders of their souls, and reclaim them from vice and misery, from every unholy and unhappy temper, from every sinful word and work; always manifesting a readiness to forgive the faults of others, as they themselves need and expect forgiveness from God. The merciful, says Erasmus, are those “who, through brotherly love, account another person's misery their own; who weep over the calamities of others; who, out of their own property, feed the hungry and clothe the naked; who admonish those that are in error, inform the ignorant, pardon the offending; and who, in short, use their utmost endeavours to relieve and comfort others.” They shall obtain mercy When they most need it. As they deal with their fellow-creatures, God will deal with them. He will incline men to show them mercy and deal kindly with them in this world, and he himself will grant them mercy and loving kindness in the day of final accounts. And since the best and happiest of mankind may need even the former, and inasmuch as all will want the latter, this is surely a strong and powerful argument to persuade us to show mercy to men, in any and every way in our power, that both God and men may show mercy to us. Add to this, that, were there no other inducement, the comfort and satisfaction arising from a disposition that renders us so like our heavenly Father, might, one would suppose, be sufficient to prevail with us to endeavour, especially in this instance, to imitate Him who, being touched with the feeling of our infirmities, was daily employed in relieving them, and even took them upon himself, continually going about doing good, and at last giving up his life to ransom ours.