“I am the true vine, and My Father is the vinedresser. Every branch in Me that does not bear fruit, He takes away; and every branch that bears fruit, He prunes it so that it may bear more fruit. You are already clean because of the word which I have spoken to you. Abide in Me, and I in you. As the branch cannot bear fruit of itself unless it abides in the vine, so neither can you unless you abide in Me. I am the vine, you are the branches; he who abides in Me and I in him, he bears much fruit, for apart from Me you can do nothing. If anyone does not abide in Me, he is thrown away as a branch and dries up; and they gather them, and cast them into the fire and they are burned.” John 15:1-6.
John Calvin in his Commentary on John 15:1-6 states:
“There is scarcely any one who is ashamed to acknowledge that every thing good which he possesses comes from God; but, after making this acknowledgment, they imagine that universal grace has been given to them, as if it had been implanted in them by nature. But Christ dwells principally on this, that the vital sap — that is, all life and strength 76 “C’est a dire, toute la vie et vigueur.” — proceeds from himself alone. Hence it follows, that the nature of man is unfruitful and destitute of everything good; because no man has the nature of a vine, till he be implanted in him. But this is given to the elect alone by special grace.”
In other words, just because people receive good things does not necessitate that the cause of these good things is universal or common grace by God. The vital sap – that is, all life and strength – is given to the elect alone by special grace.
Reformed Doctrine Daily Devotions 