There is nothing to prove in this temporal life regarding ‘truth’ itself because whether you are of the truth or not will be revealed after you die.
The proof of Truth is in the afterlife. Let’s see if the Way we follow leads us to Him or otherwise after we die.
Therefore, choose thy path wisely for it’s written that:
“For the gate is small and the way is narrow that leads to life, and there are few who find it.” – Lord Jesus Christ (Matthew 7:14)