when the door shuts

Then the LORD shut him in…  And every living substance was destroyed which was upon the face of the ground, both man, and cattle, and the creeping things, and the fowl of the heaven; and they were destroyed from the earth: and Noah only remained alive, and they that were with him in the ark. – Genesis 7:16, 23
“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”  –  Luke 13:25
Many will say to me in that day, Lord, Lord, have we not prophesied in thy name? and in thy name have cast out devils? and in thy name done many wonderful works?  And then will I profess unto them, I never knew you: depart from me, ye that work iniquity. Matt 7:22-24
Then shall the kingdom of heaven be likened unto ten virgins, which took their lamps, and went forth to meet the bridegroom. And five of them were wise, and five were foolish. They that were foolish took their lamps, and took no oil with them: But the wise took oil in their vessels with their lamps. While the bridegroom tarried, they all slumbered and slept.
And at midnight there was a cry made, Behold, the bridegroom cometh; go ye out to meet him. Then all those virgins arose, and trimmed their lamps. And the foolish said unto the wise, Give us of your oil; for our lamps are gone out. But the wise answered, saying, Not so; lest there be not enough for us and you: but go ye rather to them that sell, and buy for yourselves.
And while they went to buy, the bridegroom came; and they that were ready went in with him to the marriage: and the door was shut. Afterward came also the other virgins, saying, Lord, Lord, open to us. But he answered and said, Verily I say unto you, I know you not.  Matt 25:1-12

correction

Whoever loves discipline is wise, but he who hates correction is stupid – Proverbs 12:1

Give instruction to a wise man, and he will be yet wiser: teach a just man, and he will increase in learning.  Proverbs 9:9

Correct a wise man, and he will love thee…  Proverbs 9:8

Wise men love to be corrected, for they know it is the only way to be wiser (Pr 9:9). This is true, even if the correction hurts (Ps 141:5). They know that true love will rebuke and wound them, and they prefer this to the kisses and deceitful love of enemies (Pr 27:5-6). When you reprove such a man, he will appreciate and love you for it, so do it (Pr 25:12).

It is easy to ignore things and just let them slide.  Talking to someone about difficult things may lead to a confrontation, make them mad, or cause them to not want to be around you.

But, if you really care for someone, you care enough to let them know when they are a path to destruction and be willing to speak the truth motivated by love…

Whoever does not discipline his son hates him, but whoever loves him is diligent to correct him.
Proverbs 13:24

For the Lord disciplines the one he loves, and he corrects every son he accepts. Hebrews 12:6

through the fire

In all the land, says the LORD, two thirds of them shall be cut off and perish, and one third shall be left.

I will bring the one third through fire, and I will refine them as silver is refined, and I will test them as gold is tested. They shall call upon my name, and I will hear them. I will say, “They are my people,” and they shall say, “The LORD is my God.”

Zech 13:8-9