for, behold, you shall conceive, and bear a son; and no razor shall come on his head; for the child shall be a Nazirite to God from the womb: and he shall begin to save Israel out of the hand of the Philistines.
Samson was to live as a Nazirite because God would "begin" to deliver Israel from the Philistines through him (Judges 13:5). Samuel and David would complete this task (1 Samuel 7:10-14; 2 Samuel 5:17-25). Samson proved unfaithful in his separation to God. John the Baptist, who was apparently another Nazirite from birth, was faithful. He shows us what Samson could have become if he had valued his opportunity to serve God and had preserved his dedication to God. Evidently Manoah’s wife assumed that the Angel was a prophet (Judges 13:6).