This is one of the reasons I cannot read the New Testament alone, without the Old Testament. Somehow the NT limps and seem anemic without the OT. I always read the marginal notes citing the OT references when reading the NT. For instance, among other things, the cleansing of the Temple can be read in light of Jer. 7, where Jeremiah berates temple worshipers for their hypocrisy. That is why Jesus is not simply arrested, but is asked to produce a sign--because the Jews know he is acting in a prophetic way and they are familiar with the passage from Jeremiah. He is fulfilling the prophets. There is, of course, more to it than that--about Jesus' body as a temple.
The Reformed and Conservative Jews must realize (perhaps under the influence of the Christians) that strict external observance of the letter is not necessary to fulfill the Law. They just don't realize where the true fulfillment is. They try to do it through their natural humanity, which is why they become secular humanists.