'Written' in the Bible

I have written unto you, fathers, because ye have known him that is from the beginning. I have written unto you, young men, because ye are strong, and the word of God abideth in you, and ye have overcome the wicked one.

I have not written unto you because ye know not the truth, but because ye know it, and that no lie is of the truth.

These things have I written unto you concerning them that seduce you.

These things have I written unto you that believe on the name of the Son of God; that ye may know that ye have eternal life, and that ye may believe on the name of the Son of God.