How do you know I am truthful?

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When you can distinguish between true and false.
You can't be someone's favorite if you want, then you will understand that you speak the truth.

When you have made enemies of many people for speaking the truth. Then you will understand that you are truthful.

If someone lies, you will want to protest, then you will know that you are truthful.

When you see that no one around you wants to talk to you. Then you will understand that you are truthful.

The masked people of the society, when you can see the scary face. Then you will understand that you are truthful.

When you see that you no longer want to prove yourself truthful. Then you will understand that you are truthful.

When you see that your partner does not want to discuss anything in front of you. Then you will understand that you are truthful.

When you see everyone calling you a good person. Then you will understand that you are truthful.