15 Then Delilah pouted, "How can you tell me, 'I love you,' when you don't share your secrets with me? You've made fun of me three times now, and you still haven't told me what makes you so strong!" 16 She tormented him with her nagging day after day until he was sick to death of it. 17 Finally, Samson shared his secret with her. "My hair has never been cut," he confessed, "for I was dedicated to God as a Nazirite from birth. If my head were shaved, my strength would leave me, and I would become as weak as anyone else."
Matthew Henry's Commentary on Judges 16:15-17
Commentary on Judges 16:4-17
(Read Judges 16:4-17)
Samson had been more than once brought into mischief and danger by the love of women, yet he would not take warning, but is again taken in the same snare, and this third time is fatal. Licentiousness is one of the things that take away the heart. This is a deep pit into which many have fallen; but from which few have escaped, and those by a miracle of mercy, with the loss of reputation and usefulness, of almost all, except their souls. The anguish of the suffering is ten thousand times greater than all the pleasures of the sin.