The phrase "sound doctrine" is mentioned 4 times in the Bible. It's associated with right living and how you treat people.
There is a distinction made between doctrine and SOUND doctrine in the Bible.
1 Timothy 6:3 refers to this distinction as: the doctrine which is according to godliness.
2 Timothy 4:3 says: For the time will come when they will not endure sound doctrine.
We are living in a day when most professing Christians DO NOT want to live right. And they won’t stand for preaching that compels them to do so.
Sound doctrine gives liberty to exhort and convince.
Titus 1:9 says: that he may be able by sound doctrine both to exhort and to convince the gainsayers.
Sound doctrine is how the aged men and women live, which serves as the example to the younger.
Titus 2:1 But speak thou the things which become sound doctrine:
Finally, sound doctrine is according to the glorious gospel of Christ.
1 Timothy 1:10-11 ... and if there be any other thing that is contrary to sound doctrine; According to the glorious gospel of the blessed God, which was committed to my trust.
Sound doctrine is a charge for Christians to live right!