I'm interested to know why this author says they're writing to believers?
Whenever Paul addressed believers he always called them to a gospel-centered higher-calling.
This article mentions no deity, no moral high-ground, nor anything specific for believers. I can't find anything "doctrinally-sound' - maybe just a bit of "relevant content".
I came looking for some reminders of God's sovereignty, or perhaps an admonition to persevere, or maybe some fresh perspective of hope.... I'm left wanting.