Understanding Christ's sacrifice properly determines the quality of our observance of the Passover. To prevent taking it in a careless and unappreciative manner, Paul charges us to examine ourselves, discerning the Lord's body. "Examine" means to test, prove or scrutinize to determine whether a thing is genuine. "Discern" means to separate, discriminate, to make a distinction for the purpose of giving preference.
An example will help to illustrate what this should accomplish. I have twice had the opportunity to observe a day's play of the Masters golf tournament in Augusta, Georgia. After a short time, I became aware that the spectators there were different from fans at other professional sporting events. Besides enjoying the professional golf, I began watching and listening to the spectators just as closely and found them to be the most appreciative spectators I had ever seen. I soon discovered why. They had, for the most part, personally attempted to make the same shots that the professionals seemed to do so effortlessly. And most of them had failed! This realization drove the spectators to appreciate deeply the professional golfers' skills.
Our pre-Passover preparations should involve this principle. A major factor that enables us to take Passover in a "worthy" manner is seriously reviewing our spiritual and moral failures in contrast to the perfect glory of our Savior, Jesus Christ. This Man lived thirty-three-and-a-half years without committing even one sin!
To avoid taking Passover unworthily, we should not take it without seriously considering its meaning. If we fail to do this, instead of honoring Christ's sacrifice, we share in the guilt of those who crucified Him. However, awareness of sin should not keep us from taking Passover. It should drive us to it, for our grateful participation in eating and drinking the symbols enables our sins to be paid.
Despite our self-examination, the focus at Passover is not on ourselves but on the payment for our sins, the means by which we are forgiven. It is a time to concentrate on the most elementary precepts of our salvation, especially on the part Jesus Christ plays in it. Only by a thorough understanding of the fundamentals of any discipline, and energetically and skillfully using them, will we produce success in an endeavor. In this way of life, if we do not understand and use the fundamentals, we will not overcome sin.