A comparison between scriptures having to do with the justice of God, and scriptures explaining the mercy of God.
Justice: The justice of God did also divide the wicked from the righteous (1 Ne. 15:30).
O the greatness and the justice of our God! (2 Nephi 9:17)
And naught but peace, justice, and truth is the habitation of thy throne (Moses 7:31).
And thus we see that all mankind were fallen, and they were in the grasp of justice; yea, the justice of God, which consigned them forever to be cut off from his presence (Alma 42:14).
O my son, I desire that ye should deny the justice of God no more. Do not endeavor to excuse yourself in the least point because of your sins, by denying the justice of God (Alma 42:30).
Behold, I would tell you somewhat concerning the justice of God, and the sword of his almighty wrath, which doth hang over you except ye repent and withdraw your armies into your own lands (Alma 54:6).
And he that endureth not unto the end, the same is he that is also hewn down and cast into the fire, from whence they can no more return, because of the justice of the Father (3 Nephi 27:17).
Therefore, repent ye, and humble yourselves before him, lest he shall come out in justice against you--lest a remnant of the seed of Jacob shall go forth among you as a lion, and tear you in pieces, and there is none to deliver (Mormon 5:24).
Verily, verily, I say unto you, wo be unto him that lieth to deceive because he supposeth that another lieth to deceive, for such are not exempt form the justice of God (Doctrine & Covenants, 10:28).
Summary: Two of the pillars of God are: His laws and His justice. Our world would be chaotic without God's laws and justice. God provides repentance, along with a Savior to save us from the grasps of justice. We can pretend that God's laws do not exist, and pretend that there are no consequences for not following His commandments, but the laws remain, and the consequences will at some time come to pass.
Mercy: I will trust in the mercy of God for ever and ever (Psalms 51:8).
But God, who is rich in mercy... (Ephesians 2:4).
O the wisdom of God, his mercy and grace! (2 Ne. 9:8)
But God did call on men, in the name of his Son, saying: If ye will repent, and harden not your hearts, then will I have mercy upon you (Alma 12:33).
He shall send from heaven, and save me from the reproach of him that would swallow me up. God shall send forth his mercy and his truth (Psalm 57:3).
For he saith to Moses, I will have mercy on whom I will have mercy, and I will have compassion on whom I will have compassion (Romans 9:15).
For indeed he was sick nigh unto death: but God had mercy on him (Philippians 2:27).
Blessed be the God and Father of our Lord Jesus Christ, which according to his abundant mercy hath begotten us again unto a lively hope by the resurrection of Jesus Christ from the dead (1 Peter 1:3).
Great and marvelous are thy works, O Lord God Almighty! Thy throne is high in the heavens, and thy power, and goodness, and mercy are over all the inhabitants of the earth; and, because thou art merciful, thou wilt not suffer those who come unto thee that they shall perish! (1 Nephi 1:14)
They were delivered out of the hands of the people of king Noah, by the mercy and power of God (Alma 5:4).
And the great God has had mercy on us, and made these things known unto us that we might not perish; yea, and he has made these things known unto us beforehand, because he loveth our souls as well as he loveth our children; therefore, in his mercy he doth visit us by his angles, that the plan of salvation might be made known unto us as well as unto future generations (Alma 24:14).
But do you let the justice of God, and his mercy, and his long-suffering have full sway in your heart; and let it bring you down to the dust in humility (Alma 42:30).
And because of the mercies of the Father unto the Gentiles...(3 Nephi 16:9).
Little children cannot repent; wherefore, it is awful wickedness to deny the pure mercies of God unto them, for they are all alive in him because of his mercy (Moroni 8:19).
My servant Joseph Smith, Jun., might have power to translate through the mercy of God, by the power of God, the Book of Mormon (Doctrine & Covenants 1:29).
Glory, and honor, and power, and might, Be ascribed to our God; for he is full of mercy, justice, grace and truth, and peace (Doctrine & Covenants 84:102).
Summary: God is "rich in mercy." Love, grace, and mercy are essential and dominate characteristics of God. God (especially) showers mercy on those who are humble, obedient, repentant, and grateful.