I think the logic of Matthew 18 is similar to D&C 84 and Alma 13. In all three cases, there are two ways to receive God’s kingdom. You can become someone, or you can receive that someone:
1 At the same time came the disciples unto Jesus, saying, Who is the greatest in the kingdom of heaven?
2 And Jesus called a little child unto him, and set him in the midst of them,
3 And said, Verily I say unto you, Except ye be converted, and become as little children, ye shall not enter into the kingdom of heaven.
4 Whosoever therefore shall humble himself as this little child, the same is greatest in the kingdom of heaven.
5 And whoso shall receive one such little child in my name receiveth me.
35 And also all they who receive this priesthood receive me, saith the Lord;
36 For he that receiveth my servants receiveth me;
37 And he that receiveth me receiveth my Father;
38 And he that receiveth my Father receiveth my Father’s kingdom; therefore all that my Father hath shall be given unto him.
12 Now [those priests], after being sanctified by the Holy Ghost, having their garments made white, being pure and spotless before God, could not look upon sin save it were with abhorrence; and there were many, exceedingly great many [priests], who were made pure and entered into the rest of the Lord their God.
13 And now, my brethren, I would that ye should humble yourselves before God, and bring forth fruit meet for repentance, that ye may also enter into that rest.
(and) 6 And thus [those priests] being called by this holy calling, and ordained unto the high priesthood of the holy order of God, to teach his commandments unto the children of men, that they also might enter into his rest—