Iain Duguid, Living in the Gap Between Promise and Reality: The Gospel According to Abraham:

Praise God that he prepares his people through many difficult circumstances before he calls them to any task! By the way, that’s not just a lesson for young people to learn. Moses and Abram were still in their preparation stage long after most people have retired!

This is good new to a guy who will start seminary at the age of 40. :)