1.For fairness to the accused and verification of the accusation. It is consistent with teachings in other places in the Bible.
2. Elders are main supporters of the church. Therefore, they must be of good character. Otherwise the reputation of the church and God's name may be damaged by their behaviors.
3.The Bible clearly states that it wass because Timothy fell ill all the time. Paul suggested him to drink some wine because the alcohol in wine can kill germ, alter the body chemistry, and help with blood circulation, etc.
4.For the Scripture says, "Do not muzzle the ox while it is treading out the grain," and "The worker deserves his wages."
This means whoever shares the work should also be able to enjoy the benefit of the work. For example, when the ox is treading out the grain, do not cover his mouth because he should be allowed to eat the grains while he works.
This command of God shows how considerate He is, even to the animals.
5.Because all who believe in the Lord Jesus are brothers in Christ, supposely equal with each other. Therefore, the slave may use this point to treat his master as an equal, and not as his master.
6.All who are under the yoke of slavery should consider their masters worthy of full respect, so that God's name and our teaching may not be slandered.
There was no distinction made about the masters being believers or not. The slaves were adviced to respect them ALL as they would respect the Lord Jesus Himself.