What happened to..."I can do all things through Christ who strengthen me?"
Caleb and Joshua were different than the other Israelites they sojourned 40 years in the wilderness with. What was that difference?
They had faith. They knew that God was greater than any shortcomings they had. When these 2 men returned from "spying" the the Promised Land, they were full of faith in God. Not so the other 10 spies...nor the people they witnessed to. So they entered NOT into the Promised Land due to unbelief. They heard the gospel, but rejected its implications...same as today.
Were the Israelites more unbelieving than most people? How about us? Or does this show us how very few will see what seems impossible for us to do in our own strength is as nothing to God.
Pentecost birthed the church in power. Do we need a new Pentecost...or just a little faith?
The one does not void the other.
Regarding "
I can do all things through Christ who strengthens me", did Christ not endure sin until death? He did, but you stating this verse would seem to assert that He was baptized and then never again came under sin afterwards, and that that is the model which we are to follow. But that is not true-- On the contrary, He did come under sin afterwards, ours. And it is rather His enduring sin unto death afterwards that we are to expect to follow. Meaning the Holy Spirit comes upon us and then we continue to endure sin unto death, even after we were set free from it having been born again of the spirit of God. That is the correct precedence that He has set before us.
This is then elaborated by Paul who found to be true and declared that both the law of sin and death, his old man and his new man, continued to war against one another. I submit therefore, that this is what he meant when he said, "
we who are alive and remain"...meaning we who are alive in the spirit and in God, but remain in the flesh and in the world having yet passed from the flesh.
But since you brought up Joshua and Caleb-- that was a foreshadowing account representing Jesus and the "dog" (Caleb), meaning the salvation of the Jews and also the Gentiles, the dead and the living in Christ.