Matthew 7:14

But the door that is narrow and the road that is restricted lead to [spiritual] life and [only] a few people will find them.

Acts 14:22

[Along the way] they strengthened the hearts of the disciples, urging them to continue [to believe and practice] the faith and [explaining] that entering God's [heavenly] kingdom [See II Tim. 4:18] requires enduring many trials.

Matthew 16:24-25

Then Jesus said to His disciples, "If anyone wants to be my follower, he should deny self [i.e., of always having its own way] and lift up his cross [of responsibility] and [then he can] become my follower.

Matthew 20:16

So, the [person who seems to be] last will be first [i.e., in importance and blessings], but the [person who seems to be] first will [end up] being last."

Matthew 22:14

For many people are called [by God] but [only those] few [who respond] are chosen [by Him]."

Matthew 25:1-12

"Then the kingdom of heaven will be similar to ten bridesmaids who took their lamps and went out to meet the [bride and] groom. [Note: The picture here is that of a newly married couple returning from a festive reception to the groom's home where they continued celebrating and were welcomed by a late evening wedding party]

Mark 8:34

And He called the crowd to Him, along with His disciples, and said to them, "If anyone wants to be my follower, he should deny himself [i.e., of always having his own way] and accept his cross [i.e., his responsibilities, with all their difficulties] and then he can become my follower.

Luke 12:32

" [And], do not be afraid, little flock [Note: Jesus refers to His small band of disciples as sheep following Him as their Shepherd], for your Father was pleased to give you the kingdom.

Luke 13:23-30

[Along the way] someone asked Him, "Lord, will [only] a few people be saved?" And He answered them,

John 15:18-20

"If the world hates you, then know that it has [already] hated me, [even] before it hated you.

John 16:2

The Jewish authorities will expel you from their synagogues. In fact, the time will come when whoever kills you will think he is doing a service to God.

John 16:33

I have said these things to you so that you can have peace in [fellowship with] me. You will have trouble in the world, but cheer up, for I have conquered the world."

Romans 9:27-29

And Isaiah declares about [the nation of] Israel [Isa. 10:22-23], "[Even] if the number of Israelites were [as many] as the grains of sand in the ocean, [still only] a small minority will be saved.

Romans 9:32

Why? Because they did not [attempt to do it] by faith [in Him], but by trying to fulfill all the requirements [of the law]. So, they stumbled over "the stumbling stone," [i.e., the Jews refused to become obedient to Christ. See I Pet. 2:6-8].

Romans 11:5-6

So, now also, there is a small minority which has been selected by God's unearned favor [i.e., to be saved].

Romans 12:2

And you people must not be conformed to [the values and standards of] this age, but you should become transformed [i.e., changed in attitude and action] by having your mind renewed [i.e., to think in a totally different way]. Then you will be able to determine [and practice] God's will, the thing that is good, and acceptable and perfect.

Ephesians 2:2-3

You practiced such things when you lived according to the evil ways of this world, and according to the ruler of the [spiritual] powers of the air. [Note: This refers to Satan, whose influence permeates life around us]. He is the [evil] spirit who is now at work in people who are disobedient [to God].

1 Thessalonians 3:2-5

and so we [i.e., I] sent Timothy, our brother and God's fellow-worker in [the ministry of] the Gospel, to strengthen and encourage you in your faith,

1 Peter 3:20-21

These people had disobeyed [Noah's preaching, See II Pet. 2:5] back when God's patience waited [for them to repent, See Gen. 6:3], during the days of Noah, when the ship was being constructed. It was by that means [i.e., the ship floating them to safety through the Flood waters] that a few persons, eight of them, were saved [from destruction] through water.

Treasury of Scripture Knowledge

Summary

Because strait is the gate, and narrow is the way, which leadeth unto life, and few there be that find it.

General references

Bible References

Because

Matthew 16:24
Then Jesus said to His disciples, "If anyone wants to be my follower, he should deny self [i.e., of always having its own way] and lift up his cross [of responsibility] and [then he can] become my follower.
Mark 8:34
And He called the crowd to Him, along with His disciples, and said to them, "If anyone wants to be my follower, he should deny himself [i.e., of always having his own way] and accept his cross [i.e., his responsibilities, with all their difficulties] and then he can become my follower.
John 15:18
"If the world hates you, then know that it has [already] hated me, [even] before it hated you.
John 16:2
The Jewish authorities will expel you from their synagogues. In fact, the time will come when whoever kills you will think he is doing a service to God.
Acts 14:22
[Along the way] they strengthened the hearts of the disciples, urging them to continue [to believe and practice] the faith and [explaining] that entering God's [heavenly] kingdom [See II Tim. 4:18] requires enduring many trials.
1 Thessalonians 3:2
and so we [i.e., I] sent Timothy, our brother and God's fellow-worker in [the ministry of] the Gospel, to strengthen and encourage you in your faith,

General references

Matthew 22:14
For many people are called [by God] but [only those] few [who respond] are chosen [by Him]."
Romans 3:17
They have not known [how to walk on] a peaceful pathway."