From Thomas Brook’s classic, “Precious Remedies Against Satan’s Devices”

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…solemnly to consider, That the spiritual riches of the poorest saints infinitely transcend the temporal riches of all the wicked men in the world; their spiritual riches satisfy them; they can sit down satisfied with the riches of grace that are in Christ, without earthly honors or riches.

You can buy the book here (extremely cheap!) and likely find it online in pdf form for free. WELL WORTH THE READ! Especially if you are considering taking the One Year Challenge. Satan will certainly oppose any who who would attempt great things for God in going on mission, it is our job to put on the armor that God has provided!

“in order that Satan should not outwit us. For we are not unaware of his schemes.” 

2 Corinthians 2:11