13 “Enter by the narrow gate; for wide is the gate and broad is the way that leads to destruction, and there are many who go in by it. 14 “Because narrow is the gate and difficult is the way which leads to life, and there are few who find it. -NKJV
Jesus compares Christianity to a gate, a way, and an end.
All people have turned away from God and must be converted through repentance towards God and faith in the Lord Jesus Christ. We must be born again. We must enter the gate.
After we enter the gate the journey is not over, it has only just begun. We must walk the narrow road that leads to life by continuing to trust in Christ and submit to Him as Lord. By the power of the Holy Spirit, we must put sin to death.
At the end of the road, we will be judged according to our works. We are reconciled to God through faith in Christ, but our faith will be judged by what we have done.
For more on this topic here is a short video: