I've never heard it before, and it actually sounds like it might be a literal translation from another language.
It seems to be a very long winded way of saying something like "willpower". http://dictionary.cambridge.org/dict...tish/willpower
A person uses their willpower to control whether they choose to do/not do, or think/not to think, something. So in this respect they are referring to "free will"; the personal choices we are able to make, good or bad, which are unconstrained by fate. https://en.wikipedia.org/wiki/Free_will