As i was reading chapter 26, and the commentary, i realized that giving God the firstfruits is a demonstrable way to evidence not only thanksgiving that He blessed one with those firstfruits at all, but it also evidenced a TRUST and FAITH in God, and a rejoicing, so to speak, with no worries that they would be in "want" or "needing" anything, but trusting FULLY that not only would God PROVIDE, and ABUNDANTLY so, but that He would BLESS them in extraordinary ways...for to offer these firstfruits with a joyful heart is an expression of loving the Lord thy God with all thy heart, mind, soul, and strength, and therefore it surely MUST bless our God's heart...this verse comes to mind:
"The LORD thy God in the midst of thee is mighty; he will save, he will rejoice over thee with joy; he will rest in his love, he will joy over thee with singing." ~Zephaniah 3:17