3 Nephi 23:13

And it came to pass that Jesus commanded that it should be written; therefore it was written according as he commanded.

Keeping a written record is an important principle. God does not give us blessings and miracles to just wash over us, be taken for granted, and then forgotten. If he puts the effort into the blessing, he wants us to remember, and that means we should write it down. Though we may not like journal keeping, writing is a sign to the Lord that we value the gifts he gives us.

Jarom 1:2

And as these plates are small, and as these things are written for the intent of the benefit of our brethren the Lamanites, wherefore, it must needs be that I write a little; but I shall not write the things of my prophesying, nor of my revelations. For what could I write more than my fathers have written? For have not they revealed the plan of salvation? I say unto you, Yea; and this sufficeth me.

Jarom didn't think he had anything new or interesting to write. Nevertheless, I think everyone should write his testimony for his children. It doesn't have to be new doctrine or an amazing vision or revelation. If it is authenticate, every testimony is valuable. It doesn't matter that it is the same as everyone else's. A testimony, like love, is deeply personal and unique for each individual. A million love songs have been written, and there is still room for one more. The same is true of testimonies.

Jacob 4:3

Now in this thing we do rejoice; and we labor diligently to engraven these words upon plates, hoping that our beloved brethren and our children will receive them with thankful hearts, and look upon them that they may learn with joy and not with sorrow, neither with contempt, concerning their first parents.

This is also the hope of my heart as I write many things to my children, that they will receive them and appreciate them and learn from them. What I failed to teach them as youngsters I hope they profit from as adults.