"Thus says the LORD:
'Cursed is the man who trusts in man
and makes flesh his strength,
whose heart turns away from the LORD.'" - Jeremiah 17:5
Contrast this with:
"Blessed is the man who trusts in the LORD,
whose trust is the LORD.
He is like a tree planted by water,
that sends out its roots by the stream,
and does not fear when heat comes,
for its leaves remain green,
and is not anxious in the year of drought,
for it does not cease to bear fruit." - Jeremiah 17:7-8
This second section is interesting because it's so similar to Psalm 1 - something of a life verse for me. But the first section, vs. 5, is interesting because it declares the same thing in the negative.
The positive section about the man who trusts in the Lord goes in to all kinds of details about the kind of tree the man is, and where it's planted, and the fruit it produces etc... The negative is much more simple. It describes his sin, and then calls him merely, "cursed." I don't know about you but I'd rather not stick around in the "trusts in his own flesh" camp and find out what that entails.
Lord make us men and women that trust in you. That do not cease to bear fruit.