Wisdom of the prophets – Prophet Isaiah

“But we are all as an unclean thing, and all our righteousnesses are as filthy rags; and we all do fade as a leaf; and our iniquities, like the wind, have taken us away.” (Isaiah 64:6)

Wisdom of kings – King David

“Jehovah (God) from the heavens Hath looked on the sons of men, To see if there is a wise one — seeking God.

The whole have turned aside, Together they have been filthy: There is not a doer of good, not even one.” (Psalm 14:2 – 3)

Why?
Because even if some (including me) seem like seeking Him, it’s insincere (not in absolute truth) due to seeking God to get “eternal life”, “protection”, “blessings”, “a spouse”, “money” etc.

Wisdom of the apostles – Apostle Paul

“according as it hath been written — ‘There is none righteous, not even one;

There is none who is understanding, there is none who is seeking after God.

All did go out of the way, together they became unprofitable, there is none doing good, there is not even one.” (Romans 3:10 – 12)

Conclusion (they all spoke the “same” thing):

The righteous don’t consider their hearts as being clean because they see with wisdom the truth about how evil even their good works really are, ridden with selfish intents hidden in the heart.

However, the wicked are always carried away by the lie that they have a clean heart, being puffed up in thinking so till they lack wisdom in seeing the truth, which is otherwise.

The verses alone speak Truth.
All other opinions are lies.

P/S:

Wisdom of the prophets – Prophet Jeremiah

Advice:
“Don’t follow your heart, but rather strive as much as possible to follow or go after God’s Heart”.

Why?
Remember this truth about all our hearts:

“The heart is deceitful above all things and beyond cure. Who can understand it?” (Jeremiah 17:9)

and when you’ve learnt all this, you’ll find  yourself like Job described below:

Wisdom of the righteous – Righteous Job

“My ears had heard of You (God)

but now my eyes have seen You (God).

Therefore I despise myself

and repent in dust and ashes“

(Job 42:5 – 6)