Samson went down to Timnah, and saw a woman in Timnah of the daughters of the Philistines.
"His father and his mother knew not that it was of Jehovah"  (Judges 14:4).  This does not mean that God approved of Samson's sinful marriage, but that God overruled Samson's strong-headed determination to marry a Philistine woman and turned it into an occasion for God to show his displeasure with the Philistines.