We generally take one of two approaches to self-examination. The first is something on the order of, "I'm no good. I've never lived up to my expectations. I'm just worthless."
Some of us hail from some pretty painful backgrounds. A handful have been molested and feel worthless because of it. Others have been told they were useless from childhood and have a very low opinion of themselves. Many have just had terrible experiences that have left scars, making accurate self-examination very difficult.
We may not like ourselves, and we wonder how anyone else could like us—especially God. We may look at ourselves, at the plethora of mistakes that dot our past, and judge ourselves harshly. In some cases, we feel we are unworthy to take the Passover.
The second approach to self-examination is just the opposite. Here we give ourselves a quick once-over and go on our way. Like the man in James 1 who looks in the mirror, sees what he is, but immediately forgets, some of us fail to give our lives a thorough evaluation.
We may think, "Well, in Romans 7 it shows that Paul sinned. He didn't want to, but the sin in him caused him to. Man will never be perfect until the return of Christ. If Paul couldn't overcome sin, then I guess that God knows that we really can't get out all the sin. I'll try, but if it's too hard, I'm sure that God will understand." A person who uses this approach may feel he is taking the Passover seriously, but in fact has not done a proper self-examination.