Mac uses the story of Samson to illustrate what can cause us to stumble and hinder us in our walk with the Lord. In Samson's case it was himself and his slowness to learn that the world wanted to consume rather than complete him.
7 Ye did run well; who did hinder you that ye should not obey the truth?
1 And the children of Israel did evil again in the sight of the LORD; and the LORD delivered them into the hand of the Philistines forty years. 2 And there was a certain man of Zorah, of the family of the Danites, whose name was Manoah; and his wife was barren, and bare not. 3 And the angel of the LORD appeared unto the woman, and said unto her, Behold now, thou art barren, and bearest not: but thou shalt conceive, and bear a son. 4 Now therefore beware, I pray thee, and drink not wine nor strong drink, and eat not any unclean thing: 5 For, lo, thou shalt conceive, and bear a son; and no razor shall come on his head: for the child shall be a Nazarite unto God from the womb: and he shall begin to deliver Israel out of the hand of the Philistines.
2 Speak unto the children of Israel, and say unto them, When either man or woman shall separate themselves to vow a vow of a Nazarite, to separate themselves unto the LORD: 3 He shall separate himself from wine and strong drink, and shall drink no vinegar of wine, or vinegar of strong drink, neither shall he drink any liquor of grapes, nor eat moist grapes, or dried. 4 All the days of his separation shall he eat nothing that is made of the vine tree, from the kernels even to the husk. 5 All the days of the vow of his separation there shall no razor come upon his head: until the days be fulfilled, in the which he separateth himself unto the LORD, he shall be holy, and shall let the locks of the hair of his head grow. 6 All the days that he separateth himself unto the LORD he shall come at no dead body. 7 He shall not make himself unclean for his father, or for his mother, for his brother, or for his sister, when they die: because the consecration of his God is upon his head.
15 Love not the world, neither the things that are in the world. If any man love the world, the love of the Father is not in him. 16 For all that is in the world, the lust of the flesh, and the lust of the eyes, and the pride of life, is not of the Father, but is of the world.