What are the fruits of Calvinism? Two came to my mind just recently. 1. The hymn "Amazing Grace" (written by Calvinist John Newton). 2. The ministry of Spurgeon. Those are two major fruits of Calvinism...I am sure many others could be listed. In an article titled "Ten Effects of Believing in the Five Points of Calvinism", John Piper lists some "fruits" of accepting what is commonly called "Calvinism". I think this is a good article. His main points are: 1. These truths make me stand in awe of God and lead me into the depth of true God-centered worship. 2. These truths help protect me from trifling with divine things. 3. These truths make me marvel at my own salvation. 4. These truths make me alert to man-centered substitutes that pose as good news. 5. These truths make me groan over the indescribable disease of our secular, God-belittling culture. 6. These truths make me confident that the work which God planned and began, he will finish – both globally and personally. 7. These truths make me see everything in the light of God's sovereign purposes – that from him and through him and to him are all things, to him be glory forever and ever. 8. These truths make me hopeful that God has the will, the right, and the power to answer prayer that people be changed. 9. These truths reminds me that evangelism is absolutely essential for people to come to Christ and be saved, and that there is great hope for success in leading people to faith, but that conversion is not finally dependent on me or limited by the hardness of the unbeliever. 10. These truths make me sure that God will triumph in the end. I refer you to John Piper's article "Ten Effects of Believing in the Five Points of Calvinism"