But the wisdom that comes from heaven is first of all pure; then peace-loving, considerate, submissive, full of mercy and good fruit, impartial and sincere. James 3:17 (NIV)
Notice the words that are associated with wisdom from Heaven.
6. Full of Mercy
7. Good fruit
There are people who think they, themselves, are wise. Other people also may think they are wise. If they do not have the above characteristics, they have deceived themselves and their fans are neither observant nor do not know the definition of wisdom.