There will your heart be

Vapor of vapors, says the Preacher. Vapor of vapors! All is vapor.

Ecc 1:2

Sell your possessions, and give to the needy. Provide yourselves with moneybags that do not grow old, with a treasure in the heavens that does not fail, where no thief approaches and no moth destroys. For where your treasure is, there will your heart be also.

Luke 12:33-34

The things of this world are transitory, a vapor. Not to say matter is evil; God made it and called it good. But it's not perfect. It is corruptible. To steal a dialog from George MacDonald:

"Why not lay up for ourselves treasures upon earth?" 

"Because there the moth and rust and the thief come." 

"And so we should lose those treasures!" 

"Yes; by the moth and the rust and the thief." 

"Does the Lord then mean that the reason for not laying up such treasures is their transitory and corruptible nature?" 

"No. He adds a For: 'For where your treasure is, there will your heart be also.'"

"Of course the heart will be where the treasure is; but what has that to do with the argument?" 

This: that what is with the treasure must fare as the treasure; that the heart which haunts the treasure-house where the moth and rust corrupt, will be exposed to the same ravages as the treasure, will itself be rusted and moth-eaten. Many a man, many a woman, fair and flourishing to see, is going about with a rusty moth-eaten heart within that form of strength or beauty.