Sentence:  For he sayeth vnto Moses: I wyll haue mercy on whom I haue mercy, and haue compassion on whom I wyl haue compassion. It is not therfore of the <WSD>wyller</WSD>, nother of the runner, but of God the shewer of mercy. 
Meaning of the word marked with <WSD> tags:  One who wills; who causes by an act of will or willpower.