לזכות ר' אליעזר יצחק בן בתיה וכל בני ביתו לשפע ברכה והצלחה
What does it mean when we say in davening that when Hashem split the sea He was ברוך הוא ומבורך - Blessed is He and blessed. Why isn't one "blessed" enough?
Siach Yitzchak [Rav Yitzchak Gandman Pietrokov, Poland 1891] - Even though He is flowing with blessing, He still wants us to bless Him.
Bi-roomo Shel Olam [Rav Dov Kook Shlita] - ברוך is the actual blessing that He gives. מבורך is our perception of the blessing. Usually there is a gap between our perception and the actual bracha but at the splitting of the sea there was such a great revelation that the actual blessing and our perception were equal.
דוד המלך said כאשר שמענו כן ראינו בעיר אלקינו - As we heard so we saw in the city of Hashem. Normally we can't see with our eyes what we hear from our ancestors about the greatness of Hashem, but in עיר אלקינו - the Holy City of Yerushalayim, we can SEE what we hear.
That is all I could find. Any other ideas??
[ועי' תפארת שלמה ליקוטים עמ' קס"א]