Proverbs 22:21

that I might make you know the sureness of the words of truth; to return the words of truth to those who send to you?

Luke 1:3-4

it seemed good to me also, following all things accurately from the very first, to write to you in order, most excellent Theophilus,

1 Peter 3:15

but sanctify the Lord God in your hearts, and be ready always to give an answer to everyone who asks you a reason of the hope in you, with meekness and fear;

John 20:31

But these are written so that you might believe that Jesus is the Christ, the Son of God, and that believing you might have life in His name.

1 John 5:13

I have written these things to you who believe on the name of the Son of God, that you may know that you have everlasting life, and that you may 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 seemed good to me also, following all things accurately from the very first, to write to you in order, most excellent Theophilus,
John 20:31
But these are written so that you might believe that Jesus is the Christ, the Son of God, and that believing you might have life in His name.
1 John 5:13
I have written these things to you who believe on the name of the Son of God, that you may know that you have everlasting life, and that you may believe on the name of the Son of God.

Answer

1 Peter 3:15
but sanctify the Lord God in your hearts, and be ready always to give an answer to everyone who asks you a reason of the hope in you, with meekness and fear;

General references

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