'Written' in the Bible

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

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

These things have I written to you concerning those who lead you astray:

These things have I written to you that ye may know that ye have eternal life who believe on the name of the Son of God.