Heavenly Torah, Abraham Joshua Heschel, as translated by Rabbi Gordon Tucker, pg. 86
The basic difference in attitude to the sacrifical system may be summarized thus:
In the school of Rabbi Ishamel the view was, "Not for my sake do you offer sacrifices, but for your sakes, to satisfy your needs. For My part, I am pleased that having given you the commandements, you fulfil My will, and I shall reward you."
In the school of Rabbi Akiva, the view was, "I desire nothing else but the sacrifices. Their sweet savor brings delight to Me."