Albert Barnes Commentary Judges 14:4

"But his father and his mother knew not that it was of Jehovah; for he sought an occasion against the Philistines. Now at that time the Philistines had rule over Israel." — Judges 14:4 (ASV)

His father and mother very properly opposed Samson’s marriage with a Pagan woman, the daughter of the oppressors of his people. But they could not prevail, because it was the secret purpose of God by these means to seek occasion against the Philistines; that is, to make the misconduct of the father of Samson’s wife, which He foresaw, the occasion of destruction to the Philistines. Compare the marginal references for similar statements.