Imagine reading a comic book and Lex Luthor asks Superman, "What is your one weakness?" Knowing this villain will want to exploit his weakness to harm him and others, he willfully shares with him the secret of Kryptonite. What would you think? This super hero may be faster than a speeding bullet, and able to leap buildings in a single bound, but sharp he is not!
What's the point? This is precisely what Samson does with Delilah in Judges 16:17, after she repeatedly asks him his weakness, and attempts to use the information against him. At first glance we may ask, "What on earth was he thinking?' That is a tremendous question which has implications for us even today.