so we must persevere. and in the end save ourselves?
God it
Don't you know that Perseverance comes by God's grace, as well? Salvation is ultimately God's supernatural work that He began and He will finish (Phil 1:6).
What do you think the Good Shepherd is doing in the lives of the sheep the Father has given to Him: Sleeping at the switch? Is Jesus just another hierling shepherd who has no love for his own and just lets them wander off anywhere they want? None of the Father's sheep would be saved if it weren't for the Shepherd's watchful eye, since dumb sheep are strongly inclined to stray. Read the Parable of the Lost Sheep some day.