The word abundance here, Strong's 4051, perisseuma, meaning a surplus, a superabundance that was left over, over and above. Thayer adds that in which one delights, of that which fills the heart and that which is left over or remains.
Now the Greek word translated treasure in verse 35 is Strong's G2344, thēsauros, meaning a deposit, the place in which good and precious things are collected and laid up like a coffer, a receptacle, a treasury, a storehouse, a repository, or in our analogy, a bucket.