Then are ye in this strait and narrow path which leads to eternal life - 2 Nephi 31:18

2 Nephi 31:18

And then are ye in this strait and narrow path which leads to eternal life; yea, ye have entered in by the gate; ye have done according to the commandments of the Father and the Son; and ye have received the Holy Ghost, which witnesses of the Father and the Son, unto the fulfilling of the promise which he hath made, that if ye entered in by the way ye should receive.
2 Nephi 31:18

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we without them cannot be made perfect; neither can they without us be made perfect - Doctrine & Covenants 128:18

Doctrine & Covenants 128:18

…the earth will be smitten with a curse unless there is a welding link of some kind or other between the fathers and the children, upon some subject or other—and behold what is that subject? It is the baptism for the dead. For we without them cannot be made perfect; neither can they without us be made perfect.…
Doctrine & Covenants 128:18

Read in scriptures: http://bit.ly/1Jx2vNL