The Philistines lived on the west side of Canaan, along the Mediterranean seacoast. From Samson's day until the time of David they were the major enemy force in the land & a constant threat to Israel. The Philistines were fierce warriors; they had the advantage over Israel in numbers, tactical expertise, & technology. They knew the secret of making weapons out of iron. But none of that mattered when God was fighting for Israel.
Once again the cycle of sin, judgment, & repentance began. The Israelites would not turn to God unless they had been stunned by suffering, oppression, & death. This suffered was not caused by God, but resulted from the fact that the people ignored God, their Judge & Ruler. The warnings in God's Word are clear; if we continue to harden our hearts against God, we can expect the same fate as Israel.
The angel of the Lord could have been a special divine messenger sent from God or a pre-incarnation appearance of Jesus Christ. The reason for the angel's visit was to give Samson's parents the vital news that Samson would begin to rescue Israel from the Philistines.
Samson was to be a Nazarite - a person who took a vow to be set apart for God's service. Samson's parents made the vow for him. A Nazarite vow was sometimes for him. A Nazarite vow was sometimes temporary, but in Samson's case, it was for life. As a Nazarite, Samson could not cut his hair, touch a dead body, or drink anything containing alcohol.
Although Samson often used poor judgment & sinned terribly, he accomplished much when he determined to be set apart for God. In this way he was like the nation Israel. As long as the Israelites remained set apart for God, the nation thrived. But they into terrible sin when they ignored God.
Manoah's wife was told that her son would begin to rescue the Israelites from Philistine oppression. It wasn't until David's day that the Philistine opposition was completely crushed. Samson's part in subduing the Philistines was just the beginning, but it was important nonetheless. It was the task God had given Samson to do. Be faithful in following God even if you don't see instant results, because you might be beginning an important job that others will finish.
Samson's tribe, Dan, continued to wander in their inherited land, which was yet unconquered. Samson must have grown up with his warlike tribe's yearnings for a permanent & settled territory. Thus his visits to the tribal army camp stirred his heart, & God's Spirit began preparing him for his role as judge & leader against the Philistines.
God uses a variety of means to develop & prepare us: hereditary traits, environmental influences, & personal experiences. As with Samson, this preparation often begins long before adulthood. Work at being sensitive to the Holy Spirit's leading & the tasks God has prepared for you. Your past may be more useful to you than you imagine.
Samson's Ventures: He grew up in Zorah & wanted to marry a Philistine girl from Timnah (Timnath). Tricked at his own wedding feast, he went to Ashkelon & killed some Philistine men & stole their coats to pay off a bet. Samson then let himself be captured & brought to Lehi where he snapped his ropes & killed 1,000 people.
Reference summary used from Life Application Bible, KJV, Tyndale House Publishers, Inc., Wheaton, IL