a brief word from Cardinal Newman

"Those whom Christ saves are they who at once attempt to save themselves, yet despair of saving themselves; who aim to do all, and confess they do nought; who are all love, and all fear; who are the most holy, and yet confess themselves the most sinful; who ever seek to please Him, yet feel they never can; who are full of good works, yet of works of penance. All this seems a contradiction to the natural man, but it is not so to those whom Christ enlightens. They understand in proportion to their illumination, that it is possible to work out their salvation, yet to have it wrought out for them, to fear and tremble at the thought of judgment, yet to rejoice always in the Lord, and hope and pray for His coming."

From his sermon, "The Lapse of Time"

http://www.newmanreader.org/controversies/guides/selection.html