To me, grace doesn't mean we'll never sin or worry or fear or have troubles again; it means that even when we DO experience all of that, it will change nothing in our relationship to God. Our troubles are not a sign of His disfavor, and our sins do not produce His disfavor. He has no expectations for us to live up to. He knows we're going to fail, go astray, doubt, and struggle with difficulties. He never leaves or forsakes us, though, even though we fail or fall apart. That is one of the greatest things about His grace to me: we mess up and He still carries us! He knows we're dust. We don't deserve it, yet He stays. That's grace!
With love,