Rom 5:8: But God commendeth his love toward us, in that, while we were yet sinners, Christ died for us.
To a certain point the love of God to angels and men is identical and coincidental, but beyond that point it may be said, so far as men are concerned, it diverges into grace and mercy. That is to say, grace and mercy are terms not applicable to angels, but to sinful men. Grace always implies unworthiness in its recipients. They are unworthy, because they are sinners. Their sinfulness creates their unworthiness. If saved, they must be saved as unworthy, and therefore saved by grace. The capital fact is that grace reigns in the salvation of the unworthy. While grace regards men as unworthy, mercy contemplates them as miserable and wretched. Grace therefore means all that is included in pity, compassion, and kindred terms. The goodness of God, assuming the form of mercy, sympathizes with sinners in their ruin and wretchedness. This mercy will be glorified in the salvation of unnumbered millions in heaven.http://hbiblecommentary.wordpress.com