This quote seems to startle me every time I read it...and show me that I still have a long way to go.
O believer, learn to reject pride, seeing that you have no ground for it. Whatever you are, you have nothing to make you proud. The more you have, the more you are in debt to God; and you should not be proud of that which renders you a debtor. Consider your origin; look back to what you were. Consider what you will have been but for divine grace. Look upon yourself as you are now. Doesn’t your conscience reproach you? Don’t your thousand wanderings stand before you, and tell you that you are unworthy to be called His son or daughter? And if He has made you anything, aren’t you taught thereby that it is grace which has made you to differ? Great believer, you would have been a great sinner if God had not made you to differ. O you who are valiant for truth, you would have been as valiant for error if grace had not laid hold upon you. Therefore, don’t be proud, though you have a large estate - a wide domain of grace, once you did not have a single thing to call your own except your sin and misery. Oh!
Strange infatuation that you, who have borrowed everything, should think of exalting yourself... (Charles Spurgeon)
If you're looking for a practical and truly wonderful message on this topic, check out this one by Francis Chan, which made it worth my youngest getting up at six one morning so I could listen to it...