Well, simply, that's what God does.
Showing here: Or do you suppose it is to no purpose that the Scripture says, 'He yearns jealously over the Spirit he has made to dwell in us?' But he gives more grace. (James 4:5-6a, emphasis mine)
I've recently -- as in, today -- been convinced that no matter how gracious I feel like I'm being, it is not "enough" or "too much."
For instance: I often, subconsciously or not, consider myself a kind, grace-filled person because I think the best of people, and sometimes I'm so nice that I let people walk all over me by accident. Wow. Go me, right? Except today, as I was walking about campus, I was thinking about an issue that someone else had, and how it bugged me, and how I just wanted to pop them over the head at times. I stopped short. My heart was filled with bitterness, and nothing but a desire to see that person change so they'd stop bothering me, not because I loved them and wanted the best for them. What happened to my "grace?"
"Giving grace" doesn't mean lying to yourself and telling yourself that the person who wronged you didn't do anything wrong, after all. It doesn't mean saying absolutely sunshine-and-unicorns-nice things all the time. It's granting someone forgiveness -- indeed, exemption from what they deserve -- out of a pure love. Check this out:
For we ourselves were once foolish, disobedient, led astray, slaves to various passions and pleasures, passing our days in malice and envy, hated by others and hating one another. But when the goodness and loving kindness of God our Savior appeared, he saved us, not because of works done by us in righteousness, but according to his own mercy, by the washing of regeneration and renewal of the Holy Spirit, whom he poured out on us richly through Jesus Christ our Savior, so that being justified by his grace we might become heirs according to the hope of eternal life. (Titus 3:3-7)
Hallelujah! What more is there to say? :)
P.S. "More" is a really strange-looking word, after you stare at it for awhile.