What is grieving is strife, it is from evil not from good.
There is no strife in following the deeds of the apostles of the Lord, there is strife only in following cunningly devised fables.
At the end, people do not endure sound doctrine, only fables.
2 Timothy 4:4 And they shall turn away their ears from the truth, and shall be turned unto
fables.
2 Peter 1:16 For we have not followed cunningly devised
fables, when we made known unto you the power and coming of our Lord Jesus Christ, but were eyewitnesses of his majesty.
James 3:13 Who is a wise man and endued with knowledge among you? let him shew out of a good conversation his works with meekness of wisdom.
14 But if ye have bitter envying and strife in your hearts, glory not, and lie not against the truth.
15 This wisdom descendeth not from above, but is earthly, sensual, devilish.
16 For where envying and strife is, there is confusion and every evil work.