JL.Dagg says;
An inspired writer has said, "We love him, because he first loved us:"
142 but these words do not teach, that our love to God originates in the conviction that we are the favorites of his love. The love of God towards us, operates both as an efficient, and as a motive.
1. As an efficient cause. "For his great love where with he loved us,
143 when we were dead in sin, hath quickened us together with Christ." Here is an operation entirely distinct from that of mere motive. The dead body of Christ in the grave, was quickened by the Spirit; and a like power quickens the dead soul. "We believe according to the working of his mighty power, which he wrought in Christ, when he raised him from the dead."
144 Here faith itself is ascribed to this divine operation. All this operation proceeds from God's great love wherewith he hath loved us. It is plain, therefore, that this love operates as an efficient cause, before it operates as a motive to holiness. It cannot operate as a motive without faith; and faith is produced by its efficient power. After this efficiency has quickened the dead soul, the love of God towards us then operates.
2. As a motive. The goodness of God leads to repentance, and every attribute and act of God has a tendency to call forth the love of the heart, when in the right state. Nothing so effectually melts the heart, as a view of God's great love towards us, while we were yet sinners: and of Christ's love in giving himself for us: but many a heart has felt this melting influence, without having in view the personal benefit to be received from this love. Our love to God does not produce a disregard to our own happiness, but it rises above the consideration of it. It is, therefore, not a modification of self-love.
manual of theology dagg-book 7 chapter 3