Proverbs 22:21

that I might make thee know the certainty of the words of truth; that thou mightest carry back words of truth to them that send thee?

Luke 1:3-4

it has seemed good to me also, accurately acquainted from the origin with all things, to write to thee with method, most excellent Theophilus,

1 Peter 3:15

but sanctify the Lord the Christ in your hearts, and be always prepared to give an answer to every one that asks you to give an account of the hope that is in you, but with meekness and fear;

John 20:31

but these are written that ye may believe that Jesus is the Christ, the Son of God, and that believing ye might have life in his name.

1 John 5:13

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.

Treasury of Scripture Knowledge

Summary

That I might make thee know the certainty of the words of truth; that thou mightest answer the words of truth to them that send unto thee?

Answer

General references

Bible References

I

Luke 1:3
it has seemed good to me also, accurately acquainted from the origin with all things, to write to thee with method, most excellent Theophilus,
John 20:31
but these are written that ye may believe that Jesus is the Christ, the Son of God, and that believing ye might have life in his name.
1 John 5:13
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.

Answer

1 Peter 3:15
but sanctify the Lord the Christ in your hearts, and be always prepared to give an answer to every one that asks you to give an account of the hope that is in you, but with meekness and fear;

General references

Proverbs 18:20
A man's belly is satisfied with the fruit of his mouth; with the increase of his lips is he satisfied.