Because the love of God is shed abroad in our hearts— Is poured out into our hearts. The original word εκκεχυται, is commonly used, as Whitby remarks, when the effusion of the Holy Ghost is spoken of. Wherefore, as the Apostle, in this passage, had in his eye the gifts of the Spirit bestowed on the Gentiles, as proofs of God's love to them, he adds for their comfort and encouragement, that the love of God was poured out into their hearts along with the spiritual gifts.
By the Holy Ghost which is given unto us.— The spiritual gifts bestowed on the first Christians were clear proofs, especially in the case of the Gentiles, of the love which God bare to them, and of his will that they should be saved. And therefore, when the Jewish believers, whoreproved Peter for preaching the Gospel to Cornelius and his friends, heard that they had received the Holy Ghost, they held their peace, and glorified God, saying, Then hath God also to the Gentiles granted repentance unto life, Acts 11:18. Farther; the ordinary influences of the Spirit, bestowed on believers, by renovating their nature, afford them the fullest assurance of pardon and acceptance through faith: hence they are said to be sealed with that holy Spirit of promise, which it the earned of our inheritance, Ephesians 1:13-14 and is said, Romans 8:16, to bear witness with their spirit, that they are the children of God.