The witness of the lord jesus differs from the witness of others by being:

The answer is: Faithful
In christian Religion, Jesus Christ is regarded as the faithful and true witness, the ruler of God's creation.
Since Jesus Christ is basically the God Himself, all the teachings that come from Jesus is considered as the true teaching from the Holy one.

You can drink laxative, or  do this exercise when you are sitting in the bathroom on the toilet. to relieve  constipation  fast or in about 1 minute, pinch your nose after your usual exhalation. start holding your breath. but do not mouth breath during this just hold your breath.