Well, formulating the neat little construct and then finding proof-texts to support it is precisely what got them in trouble.
In their defense, the greater evil of their moment (and of the previous 1000 years) was the roman catholic church and they felt they needed an intellectual defense which insultated the 'salvation/damnation' decision entirely away from the decision of men in order to defeat the corruption of the RCC. Perhaps so. (Remembering that no one could read the Bible for themselves at that time; the RCC had seen to that.]
Now that we have the Gospel in our hands and in our language, it is obvious that the construct is irreconcilable with the "whosoever will" of the Gospel. So, while we owe the reformers a great debt for freeing us from the RCC, Christ speaks through the Bible to every heart and those who accept His offer will be saved. It is clear beyond doubt that He -- the Giver of Life -- excluded no one from His offer -- not one.
I mean salvation can't be ALL due to God? He can't hog all the glory, can He? It's impossible to have a free choice and for God to choose His elect, like the Bible clearly teaches, isn't it?
I mean it may be 99% due to Him, but I've got my 1% to contribute, right? And I'm sure I'll get it right...won't mess up...will I?