Respectfully, I think what Grandpa is suggesting, is that you are making your eternal deliverance your choice by accepting his offer, when, in actuality, God never offered you a choice. It was God's will that Jesus was to be a sacrifice to pay for the sins of his elect. Jesus's offering was to God, for God's acceptance, and not to man for man's acceptance. Jesus died only for those that God gave him, and every one of them will live in heaven with him, without losing any of them. John 6:37-40.
John 15:16, Ye have not chosen me, but I have chosen you,.......and ordained (make, purpose= Greek meaning) you.
While I am in John 15, I might call your attention to verse 18; If the "world" hate you, ye know that it hated me before it hated you. This is not the same "world" as found in John 3:16, God loved the "world" of those who believe, and only his sheep hear his voice,(to believe), and he knows them, and they follow him. John 10:27.