“And He went through the cities and villages, teaching, and journeying toward Jerusalem. Then said one unto Him, ‘Lord, are there few that be saved?’ And He said unto them, ‘Strive to enter in at the strait gate: for many, I say unto you, will seek to enter in, and shall not be able. When once the Master of the house is risen up, and hath shut to the door, and ye begin to stand without, and to knock at the door, saying, Lord, Lord, open unto us; and He shall answer and say unto you, I know you not whence ye are: then shall ye begin to say, We have eaten and drunk in Thy presence, and Thou hast taught in our streets. But He shall say, I tell you, I know you not whence ye are; depart from Me, all ye workers of iniquity. There shall be weeping and gnashing of teeth, when ye shall see Abraham, and Isaac, and Jacob, and all the prophets, in the kingdom of God, and you yourselves thrust out. And they shall come from the east, and the west, and from the north, and the south, and shall sit down in the kingdom of God. And, behold, there are last which shall be first, and there are first which shall be last.’” Luke 13:22-30 (KJB)
The gate is narrow. Jesus speaks of the narrow gate in another place as well (Matthew 7:13-14) which seems to imply with difficulty, due to blockages, hindrances, or obstacles in the way.
The needle’s eye passage of Scripture could apply here as well,
“Verily I say unto you, That a rich man shall hardly enter into the kingdom of heaven. And again I say unto you, It is easier for a camel to go through the eye of a needle, than for a rich man to enter into the kingdom of God.” Matthew 19:23-24
Though this passage is speaking directly of the rich who are encumbered with the dangers of wealth toward the spirit; it can also apply to the religious but lost crowd. Letting, like the Pharisees, the knowledge of Scripture, theology, and pride keep them from knowing the Person of the great salvation that is available to all who will receive Him as a little child.
The end result of rejecting God’s plan of grace and salvation is not good. Read again the words of Jesus. Jesus is God’s plan of grace and salvation.