”I frankly confess that, for myself, even if it could be, I should not want ‘free-will’ to be given me, nor anything to be left in my own hands to enable me to endeavour after salvation; not merely because in face of so many dangers, and adversities, and assaults of devils, I could not stand my ground and hold fast my ‘free-will’ (for one devil is stronger than all men, and on these terms no man could be saved); but because, even were there no dangers, adversities, or devils, I should still be forced to labour with no guarantee of success, and to beat my fists at the air. If I lived and worked to all eternity, my conscience would never reach comfortable certainty as to how much it must do to satisfy God. Whatever work I had done, there would still be a nagging doubt as to whether it pleased God, or whether He required something more…. But now that God has taken my salvation out of the control of my own will and put it under the control of His, and promised to save me, not according to my working or running, but according to His own grace and mercy, I have the comfortable certainty that He is faithful and will not lie to me, and that He is also great and powerful, so that no devils or opposition can break Him or pluck me from Him. ‘No one,’ He says, ‘shall pluck them out of my hand, because my Father which gave them me is greater than all’ (John 10.28-29). Thus it is that, if not all, yet some, indeed many, are saved; whereas, by the power of ‘free-will’ none at all could be saved, but every one of us would perish.
Furthermore, I have the comfortable certainty that I please God, not by reason of the merit of my works, but by reason of His merciful favour promised to me; so that, if I work too little, or badly, He does not impute it to me, but with fatherly compassion pardons me and makes me better. This is the glorying of all the saints in their God.” – Martin Luther, The Bondage of the Will, 313-314
”28 And we know that God causes all things to work together for good to those who love God, to those who are called according to His purpose. 29 For those whom He foreknew, He also predestined to become conformed to the image of His Son, so that He would be the firstborn among many brethren; 30 and these whom He predestined, He also called; and these whom He called, He also justified; and these whom He justified, He also glorified.
31 What then shall we say to these things? If God is for us, who is against us? 32 He who did not spare His own Son, but delivered Him over for us all, how will He not also with Him freely give us all things? 33 Who will bring a charge against God’s elect? God is the one who justifies; 34 who is the one who condemns? Christ Jesus is He who died, yes, rather who was raised, who is at the right hand of God, who also intercedes for us. 35 Who will separate us from the love of Christ? Will tribulation, or distress, or persecution, or famine, or nakedness, or peril, or sword? 36 Just as it is written,
“For Your sake we are being put to death all day long;
We were considered as sheep to be slaughtered.”
37 But in all these things we overwhelmingly conquer through Him who loved us. 38 For I am convinced that neither death, nor life, nor angels, nor principalities, nor things present, nor things to come, nor powers, 39 nor height, nor depth, nor any other created thing, will be able to separate us from the love of God, which is in Christ Jesus our Lord.”
Romans 8:28-39 (NASB)