There are some people that I read or listen to in order to be inspired. There are some people that I follow in order to learn more. And then there is the person that I listen to in order to be challenged.
Erwin McManus is not just a great speaker and writer but is someone that if you listen will challenge you to be more then you thought you could.
I highly recommend the Mosaic podcast and also his book Uprising. I haven't read Soul Cravings yet, but am looking forward to it.