It’s most easily shown in a couple of Paul’s letters and in Hebrews, but I think you might prefer what the gospels record Jesus saying; so I’ll suggest Matthew 25, especially towards the end, and some chunks in Luke 12 too, probably centring around verse 49. His first and second comings have quite different missions. You can also see the progression even in his lifetime in how he tried to help and teach the leaders at the start, but by the end he practically eviscerated the Pharisees for their unrepentant hypocrisy (Matthew 23).

There’s also the temptations of Jesus: skipping the pain and taking over (to fix things, as he will eventually) was a temptation to him. He had the power, he had to decide not to use it on himself. Consider also Gethsemane.