Mosiah 2

Mosiah 2:3 And they also took of the firstlings of their flocks, that they might offer sacrifice and burnt offerings according to the law of Moses; 4 And also that they might give thanks to the Lord their God. This idea of sacrifice as an expression of gratitude is one that I wonder whether it still exists. It was not only common in the Old Testament, but commanded. Is it still commanded? Is tithing a "sacrifice"? I haven't thought of it that way, but I feel that a significant part of the reason I pay it is gratitude. When we fulfill our callings, is that a sacrifice made to show gratitude? Should we think of it that way? I wonder how it changes the thing that you are doing if you change your mindset to be, "I am teaching this lesson to express gratitude to heavenly father for the blessings he has given to me."