What is the felling of a burden from the lord?

The rebellious nature of the human heart has not changed since Jeremiah's day. Even then, the people had grown weary of the constant warnings and urgings of the prophets. Or, as some people would complain today, it seems that some ministers are always preaching sermons of "doom and gloom," of sin and judgment.

The people considered God's word burdensome, and would say to the prophets, "What is the burden of the Lord now?" To such blatant irreverence, God replied, "It's you! You are the burden!" Thus there is a play on words here in Jeremiah – whereas in one instance the burden refers to the message of prophecy, in the next it refers to the people as a troublesome group in God's eyes.

http://www.vincentcheung.com/2005/12/04/the-burden-of-the-lord/

To 'grieve his spirit',
especially when we are disobediant creatures! that is why he shortened our 'life span' down to if your lucky '1oo years'!, in the days of Noah, people lived to 900 plus years, but bcse we were always being disobediant it got 'shortened!!!

And if he tells you to tell somone what he wan's them to hear, and you don't do it, 'that grieves his spirit'
too, but mostly "SIN' is what really 'greives god's spirit, he abhors sin.

Well, it's like the felling of a tree, except that in this case, you use the tree to make a cross.