I agree with Dr. Eckleburg. If salvation by faith alone is understood, following Luther, to exclude human cooperation with works of free will, then single predestination makes no sense, it is double or nothing.
Everything good comes from God.
"Every good gift and every perfect gift is from above, and cometh down from the Father of lights, with whom is no variableness, neither shadow of turning." -- James 1:17
"And we know that in all things God works for the good of those who love him, who have been called according to his purpose." -- Romans 8:28
"So then it is not of him that willeth, nor of him that runneth, but of God that sheweth mercy." -- Romans 9:16
"For the children being not yet born, neither having done any good or evil, that the purpose of God according to election might stand, not of works, but of him that calleth" -- Romans 9:11