Whenever you do judge, the only basis of judgment is not your own perspective or anything else, it's the very character and nature of God and that's why we are to allow Him to exercise His justice, where I personally want to take it upon myself.
What Jesus forbids is self-righteous, officious, hasty, unmerciful, prejudiced, and unwarranted condemnation based on human standards and human reasoning... [He condemns] the judgment of motives, which no mere human being can know of another, and to judgment of external forms.
Author: John MacArthur Source: Matthew 1-7, p. 433, 432.
Whenever we assign people to condemnation without mercy because they do not do something the way we think it ought to be done or because we believe their motives are wrong, we pass judgment that only God is qualified to make.
The one who judges according to the word and law of the Lord, and forms his judgments by the rule of charity, always begins with subjecting himself to examination, and preserves a proper medium and order in his judgments.
The nature and end of judgment or sentence must be corrective, not vindictive; for healing, not destruction.
Author: John Owen Source: A Puritan Golden Treasury
The sufficiency of Scripture means that we don't need any more special revelation. We don't need any more inspired, inerrant words. In the Bible God has given us, we have the perfect standard for judging all other knowledge. All other knowledge stands under the judgment of the Bible even when it serves the Bible.
Author: John Piper Source: Thoughts on the Sufficiency of Scripture, February 9, 2005.