There are those who think more highly of themselves than they ought to think. They speak evil of their brethren because after a thing is done they can look back and tell how differently they would have done it, but their forethought would not have been any better than that of their brethren had they been in their place....
Keep yourselves off the judgment seat. All judgment is committed unto the Son of God.... Satan works zealously to cause men to offend on this point. Those whose tongues are so free to utter words of criticism, the adroit questioner who draws out expressions and opinions which have been put into minds by sowing seeds of alienation, are his missionaries. They may repeat the expressions they draw from others as originating with the ones they so slyly led on to forbidden ground. These persons seem always to see something to criticize and condemn.... Their tongues are ready to exaggerate everything evil. What a great matter a little fire kindleth!
Never let your tongue and voice be employed in discovering and dilating upon the defects of your brethren, for the record of heaven identifies Christ’s interests with those He has purchased with His own blood. “Inasmuch as ye have done it unto one of the least of these my brethren,” He says, “ye have done it unto me” (Matthew 25:40). We are to learn to be loyal to one another, to be true as steel in the defense of our brethren. Look to your own defects. You had better discover one of your own faults than ten of your brother’s. Remember that Christ has prayed for these, His brethren, that they all might be one as He is one with the Father. Seek to the uttermost of your capabilities to be in harmony with your brethren to the extent of Christ’s measurement, as He is one with the Father....
“Love as brethren, be pitiful, be courteous” (1 Peter 3:8). True moral worth does not seek to have a place for itself by evil thinking and evil speaking, by demeriting others. All envy, all jealousy, all evil speaking, with all unbelief, must be put away from God’s children. HP 178
So today men may resort to the sacred pavilion of the Most High and feel the assurance of His promise, “My people shall dwell in a peaceable habitation, and in sure dwellings, and in quiet resting places.” Pr 212
"Let all bitterness, and wrath, and anger, and clamour, and evil speaking, be put away from you, with all malice:" Ephesians 4:31 (King James Version)