Whose Failing Now?

I was considering the blessings of Ephesians 1 and a thought occurred to me. Remember, Paul says He "has blessed us in Christ with every spiritual blessing in the heavenly places" (Eph 1:3). Not "will bless us" or "might bless us." "Has blessed us." Done deal. So we have these spiritual blessings already. So, let's look.

Check some of these out. We're chosen in Him before the foundation of the world that we might be holy and blameless (Eph 1:3). We're predestined for adoption as sons (Eph 1:5). We have redemption through His blood (Eph 1:7). We have obtained an inheritance according to the purpose of Him who works all things according to His will (Eph 1:11). We have the guarantee of the Holy Spirit (Eph 1:14). That's not the entire list, but there is something in these that I've included that seem to prove an important doctrine. If these are true, is it evenly remotely possible that we might lose our salvation? If we did, He chose wrong, failed in His predestination, didn't provide sufficient redemption, withdrew our inheritance, and canceled the guarantee of His Spirit.

I know a lot of people who believe you can lose it. I can't seem to put "You can lose it" up against Scriptures like these (and so tightly compacted in this text) and say, "Yep! You might just lose it!" The failure in that case wouldn't be ours. It would be God's failure. And we know that's impossible. So, in the end, I have to believe in the perseverance of God for the saints.