In Nectar of Devotion 64 qualities of Krishna are listed and number 17 is that Krishna is grateful.
It is described how Draupadi was in that awkward position… and they tried to disrobe her. At first she tried to hold on. But what could she do? She just threw her hands up in the sky and said: “He Govinda!” She called out the name of Krishna. And Krishna says:”Whenever I remember how Draupadi just called out My name and surrendered to Me than My hearth melts.”
And it is said that whenever Krishna remembers how Draupadi took shelter of Him in such a difficult situation, than Krishna becomes grateful in His heart, and His appreciation is increasing. Every time He thinks of that He feels so much appreciation and each time His appreciation gets more and more and more.
Now, Krishna has a perfect memory and He remembers everything eternally. So we can understand that His appreciation is growing eternally.In Bhagavad-gita we have that famous verse (BG 2.40.)
pratyavayo na vidyate
sv-alpam apy asya dharmasya
trayate mahato bhayat
That verse is sometimes referred to as a spiritual bank balance verse. It is the verse where it is said that whatever little bit of devotional service you do it is never lost- it goes to the spiritual bank balance and later on you pick up there. Now this statement of the Nectar of Devotion is linked with that verse because it is describing the interest that you get.
So, not only there is a spiritual bank balance, but there is also a very good interest rate.
If you want to invest your savings in any bank than go for the spiritual bank balance because you get unlimited interest- you cannot lose!
Part of the lecture given by HH Kadamba Kanana Swami SB-2.2.37 27-jul-2002