...Now since you are celebrating the holy Pascha, you should know, brethren, what the Pascha is. Pascha means the crossing-over, and so the Festival is called by this name. For it was on this day that the Children of Israel crossed over out of Egypt, and the Son of God crossed over from this world to His Father. What gain is it to celebrate unless you imitate Him Whom you worship; that is, unless you cross over from Egypt, that is, from the darkness of evildoing to the light of virtue, from the love of this world to the love of your heavenly home?
AmbroseIf someone offends you, don't tell anyone about it except your elder, and you will be peaceful. Bow to everyone, paying no attention whether they respond to your bow or not. You must humble yourself before everyone and consider yourself the worst of all. If we have not committed the sins that others have, perhaps this is because we did not have the opportunity - the situation and circumstances were different. In each person there is something good and something bad; we usually see only the vices in people and we see nothing that is good.
AmbroseWe 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.
AmbroseWhen I am at Rome I fast as the Romans do; when I am at Milan I do not fast. So likewise you, whatever church you come to, observe the custom of the place, if you would neither give offence to others, nor take offence from them.
Ambrose