Luke 13:24
"You should try hard to enter [God's kingdom] by means of the narrow door, for I tell you, many people will try to enter it but will not be able to.
Matthew 7:13-14
"You should enter [God's kingdom] by means of the narrow door, for the wide door and the broad road are the ones that lead to [spiritual and physical] destruction. And many people will enter [that wide door].
Matthew 11:12
And from the days of John the Immerser the kingdom of heaven is experiencing turmoil, for violent men are [trying to] take control of it [by bringing it into existence] forcibly [i.e., before its appointed time. See Acts 1:6-7].
Mark 6:18-20
For John had said to Herod, "It is unlawful for you to marry your brother's wife."
Luke 21:36
But you should be alert at all times, offering earnest prayers, so that you will be strong enough to escape all these things that will happen, and to appear [acceptable] in front of the Son of man [on that day]."
John 6:27
Do not work for the [kind of] food that spoils, but for the kind that lasts until never ending life. The Son of man will give you this [kind of food], for God the Father has placed His seal [of approval] on Him."
John 7:34
You people will be looking for me, but you will not find me; and you will not be able to go where I will be."
John 8:21
Jesus again said to them, "I am going away and you will look for me, but you will die [condemned] in your sins. You cannot go where I am going."
John 13:33
"I will be with you, [my dear] children, for only a little while [longer]. You people will look for me, but I am now telling you what I told the Jewish authorities, 'You will not be able to go where I will be.'
Romans 9:31-33
But the Israelites, who were attempting to become right with God by [conformity to] the law of Moses, never achieved [this righteousness] by that law.
Romans 10:3
For they did not know about God's way of making people right with Himself, so they attempted to establish their own way. In doing this they did not submit to God's way for being made right with Him.
1 Corinthians 9:24-27
Do you not know that [although] everyone runs in a race, only one person wins the prize? So, you should run in order to win.
Philippians 2:12-13
So then, my dear ones, just as you people were always obedient [to my teaching] when I was there with you, so now, in my absence [also], be [obedient] all the more. [Continue to] complete your own salvation [i.e., by living faithfully to the end. See Rom. 13:11] with fear and trembling [i.e., with a reverent and submissive spirit],
Colossians 1:29
This is the reason that I work hard and struggle also, using God's mighty power which is at work in me.
Hebrews 4:11
So, we should do our best to enter into that state of rest, so that no one fails [to do so] by following the same example of disobedience [i.e., as seen in the Israelites. See verses 2, 6].
2 Peter 1:10
So, brothers, be diligent to make sure of your calling and election [i.e., of your status as being selected by God], for when you do, you will never stumble [and fall away from God].