There are many verses in the Bible that talk of God's love for ALL His children, and challenges galore similar to "If ye love me, keep my commandments." (John 14:15) This says, essentially, "If you say you love me, prove it by doing what I have told you to do." It also might be translated as, "If you really love me, it will be evident because you will keep my commandments" - but the central message is, "The ball is in your court to do more that just give me lip service. You need to go beyond that and actually do what I ask of you." This leads to:
If God really has chosen the saved and damned prior to our earthly existence, what is the purpose of this existence? If it’s not to gain a physical body, to choose freely and independently to love and serve God and to “accept” the “offering” of the Atonement (even the word “offering” implies the ability to reject or accept that “offer”), then what is it? If the result is predetermined, why is this life necessary for us? If we truly have no choice in the matter, we really are puppets on a string - and “personal will” is a completely meaningless phrase. If we really have no ability to control our destiny, then God is the most terrible sadist in the history of the world - roasting many of His children (the vast majority of them, according to many predestination perceptions) eternally in Hell for no other reason than He decided it was what He wanted to do.
I can't judge Calvin personally, but I classify predestination as nothing more than Satan's more evil uncle's plan - since in Satan's plan at least everyone would have returned to God. They wouldn't progress and grow and gain anything as a result, but at least billions of them wouldn't end up burning in Hell through no choice of their own.