“Do not fight against these harmful spells. For you do not know what God wants with them. You do not know the greater divine plan behind it all.”
As attributed by Kai Lehmann, curator of the exhibition "Luther und die Hexen" ("Luther and the witches"). (2013) in “Interview with Dr. Kai Lehmann, curator of the exhibition "Luther und die Hexen" ("Luther and the witches")“ https://www.luther2017.de/en/wiki/martin-luther-and-the-witches/kai-lehmann-martin-luther-firmly-believed-in-witches/
Disputed
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Martin Luther 214
seminal figure in Protestant Reformation 1483–1546Related quotes

“Character is doing what you don't want to do but know you should do.”
Variant: Do what you don’t want to do to get what you want to get.
“It's important to know what you don't want, but it's vital to know what you DO want.”
Source: Life, the Truth, and Being Free (2010), p. 152

We The Living (1936)
Source: We The Living Part One Chapter 6

“Make sure you are doing what God wants you to do—then do it with all your strength.”
This saying is not found in any source before 2010, when it was posted by The Ignorant Fisherman at Free Republic http://www.freerepublic.com/focus/bloggers/2451682/posts on 15 February. The language is not that of Washington or his time.
Misattributed, Spurious attributions
The Art of Doing Science and Engineering: Learning to Learn (1991), p. 5