Moses 7

As Enoch was shown the things that were yet to come -

"...Enoch also saw Noah, and his family; that the posterity of all the sons of Noah should be saved with a temporal salvation;
43 Wherefore Enoch saw that Noah built an ark; and that the Lord smiled upon it, and held it in his own hand; but upon the residue of the wicked the floods came and swallowed them up."  (Pearl of Great Price | Moses 7:42 - 43)

This must have really bothered Enoch knowing that many of his family would be lost in the flood for he cried unto the Lord -

"...I ask thee, O Lord, in the name of thine Only Begotten, even Jesus Christ, that thou wilt have mercy upon Noah and his seed, that the earth might never more be covered by the floods..."  (Pearl of Great Price | Moses 7:50)

"And the Lord could not withhold; and he covenanted with Enoch, and sware unto him with an oath, that he would stay the floods; that he would call upon the children of Noah;
52 And he sent forth an unalterable decree, that a remnant of his seed should always be found among all nations, while the earth should stand..."  (Pearl of Great Price | Moses 7:51 - 52)

I'm sure Enoch was worried for his posterity, those that would remain righteous and those that may have not had the opportunity to sufficiently repent before the flood.  So the Lord continues to teach -

"...Blessed is he through whose seed Messiah shall come; for he saith—I am Messiah, the King of Zion, the Rock of Heaven, which is broad as eternity; whoso cometh in at the gate and climbeth up by me shall never fall; wherefore, blessed are they of whom I have spoken, for they shall come forth with songs of everlasting joy.
54 And it came to pass that Enoch cried unto the Lord, saying: When the Son of Man cometh in the flesh, shall the earth rest? I pray thee, show me these things.
55 And the Lord said unto Enoch: Look, and he looked and beheld the Son of Man lifted up on the cross, after the manner of men;
56 And he heard a loud voice; and the heavens were veiled; and all the creations of God mourned; and the earth groaned; and the rocks were rent; and the saints arose, and were crowned at the right hand of the Son of Man, with crowns of glory..."  (Pearl of Great Price | Moses 7:53 - 56)

Even then adding concerning those that who had not been given sufficient opportunity to repent -

"And as many of the spirits as were in prison came forth, and stood on the right hand of God; and the remainder were reserved in chains of darkness until the judgment of the great day."  (Pearl of Great Price | Moses 7:57)

Peter taught the same -

"For Christ also hath once suffered for sins, the just for the unjust, that he might bring us to God, being put to death in the flesh, but quickened by the Spirit:
19 By which also he went and preached unto the spirits in prison;
20 Which sometime were disobedient, when once the longsuffering of God waited in the days of Noah, while the ark was a preparing, wherein few, that is, eight souls were saved by water."  (New Testament | 1 Peter 3:18 - 20)

It becomes apparent that the Lord will be fair giving all mankind an opportunity to repent.

There is one somewhat hidden doctrine in the teaching of the Savior..."whoso cometh in at the gate and climbeth up by me...".  It is also apparent that in addition to His grace, we have an obligation to repent and be baptized and climb or grow by Him for as Amulek taught -

"...he shall not save his people in their sins".  (Book of Mormon | Alma 11:3)