When someone comes to me complaining of a lack of fervor, I give what seems to me to be the only reasonable counsel: Then pray for the gift of fervor!
I, a Catholic, advised a fellow Catholic who said everything depended on our ability and willingness to forgive. Sure, in a way, forgiveness is a kind of pons asinorum. Water only flows in pipes open at both ends, one end to receive, the other to give. But can I forgive without God's prevenient grace? Everything depends on God, and that includes my ability to forgive.
Obviously, a Catholic won't be a Calvinist. But Calvin, for all his snark, was no fool. An adequate theology has to tangle with the utter Sovereignty of God. And a Christian living in the hope of glory sees that there will always be more to understand about God, that his mystery will always be at least one step ahead of our comprehension.
So, in one of the “canticles” or songs of Isaiah, which appears in our 4 week cycle of daily prayers, we sing, “... for you have accomplished everything we have done.” [Is 26: 12b, RSV — thou hast wrought for us all our works.]
AND I never tire of referring to Philippians 2:12b-13: ... work out your own salvation with fear and trembling; for God is at work in you, both to will and to work for his good pleasure.
He made us to respond to the Good. He enables the response. When we fall in love, it is both a receiving and an acting. We do not lose our freedom, we find it.
And yet, he says that he came to save all mankind.
His foreknowledge does not imply an arbitrary picking of winners and losers.
We all come to Christ as absolute and complete sinners, none better than the other.