From the Orthquote list, 19 Nov 2006:

From St. Ambrose (The Nicene and Post-Nicene Fathers:Second Series Vol. X; Eerdmans pg. 310):
 
"We ask for what reason our Lord was unwilling to state the time of His coming (cf. Mk. 13:31-32). If we ask it, we shall not find it is owing to ignorance, but to wisdom. For it was not to our advantage to know; in order that we being ignorant of the actual moments of judgment to come, might ever be as it were on guard, and set on the watch-tower of virtue, and so avoid the habits of sin; lest the day of the Lord should come upon us in the midst of our wickedness."

The Eastern Orthodox Churches often object to the western / Catholic concept of original sin.

The SDA2RC blog lists two excellent articles by Orthodox authors about why this may simply be a misunderstanding of terminology, with both sides quite compatible in their beliefs.

That's something I've felt about many Protestant teachings as well.  If people are willing to listen to and try to understand each other, they usually find they agree on more than they realised.  If they only want to disagree, and judge without finding out what is really believed - pre-judge, or prejudice - all we get is a waste of time.