Psalm 66:16 Come and hear, all you who fear God, and I will tell what he has done for my soul.

This is the suggested reading when searching the word witness in my bible search engine.

It is interesting that it is suggested to witness to people who already fear God.

Luke 24:48-49 English Standard Version

You are witnesses of these things. And behold, I am sending the promise of my Father upon you. But stay in the city until you are clothed with power from on high.”

Stay in the city, in safety, until His promise clothes you in His power.

John 14:26 But the Helper, the Holy Spirit, whom the Father will send in my name, he will teach you all things and bring to your remembrance all that I have said to you.

John 15:26 But when the Helper comes, whom I will send to you from the Father, the Spirit of truth, who proceeds from the Father, he will bear witness about me.

The Holy Spirit in you will bear witness that God has done all the good things for your soul.

A vessel of light is not the light but it shines none the less.

Proverbs 23:23 Buy truth, and do not sell it; buy wisdom, instruction, and understanding.

If we are to buy truth, where do we go to buy truth? Where can we find truth?

International Standard Bible Encyclopaedia

Truth:

trooth (‘emeth, emunah, primary idea of “firmness,” “stability”, hence “constancy,” “faithfulness,” 

Since we are Christians we should seek a biblical understanding, not a worldly definition. Why we are seeking truth is as important as how to make the purchase.

John 8:32 and you will know the truth, and the truth will set you free.

Jesus said where we can find truth in the previous verse John 8:31 “If you abide in my word”.

His Word contains the truth we seek.

Isaiah 45:19 I did not speak in secret, in a land of darkness; I did not say to the offspring of Jacob, ‘Seek me in vain.’ I the Lord speak the truth; I declare what is right.

John 8:12 Again Jesus spoke to them, saying, “I am the light of the world. Whoever follows me will not walk in darkness, but will have the light of life.”

John 14:6 Jesus said to him, “I am the way, and the truth, and the life. 

He is truth who is faithful and will never lie to you.

What do we use for currency?

Around 430 BCE, the Greek orator Antiphon wrote, “The most costly outlay is time.”

Spend more time in the Word and we will have more wisdom, instruction, and understanding.