The Bible is very direct when it talks about the heart.
The heart is deceitful above all things and beyond cure. Who can understand it? (Jer 17:9)
Above everything else guard your heart, because from it flow the springs of life. (Prv 4:23)
That’s just two verses which my focus to show what God says about human’s heart. That it’s deceitful, but it needs to be guarded / watched.
Wisdom is to accept what He says as truth. While foolishness of man is to think that we know better than God, and that we don’t need to accept what He says.
How does wisdom affect our lives?
Says there is a man who is not happy because he thinks that his wife like to boss him around (which I know there’re many and I know many men won’t be happy). But where does the unhappiness come from? There could be many possibilities. One possibility that I can think of is that God says to wife to respect their husband. And when we don’t follow His words, we won’t enjoy the blessing & happiness that comes from it. Now, assuming they do not know God’s wisdom, and instead, the man resorted to apply his own wisdom. He could choose to remain unhappy, or he could fight back. Both will not end up well.
Now, what if the man listened to God’s wisdom? For God also says for man to love his wife in His Word. And if he obeyed God’s command and instead of doing nothing or fighting back, he chose to love his wife. I bet his wife would eventually respect him, not because other things, but simply because he won her heart.
The good things is wisdom of God is made available to everyone. But some will mock wisdom and will not put their life into it. God says they are fool. We will know eventually whose word is right. For every tree will bear fruits. Wisdom will bear fruits as well as folly.
they will eat the fruit of their ways
and be filled with the fruit of their schemes.For the waywardness of the simple will kill them,
and the complacency of fools will destroy them;
but whoever listens to me will live in safety
and be at ease, without fear of harm.”