Yes controlling the mind is most difficult. I still struggle with some anger, frustration, etc., I should be able to control it.
Why is it so difficult to control when I can plainly see it's not something I want?
Why does it come back when I have specifically decided that I don't want or need it?
We didn't create the cosmos, and we didn't ask to be created. Why then must we be hounded by the karmic wheel?
Possibly the question needs to be posed in a different way. As God why did I decide to divide myself up into all these multifarious forms and to thus suffer until I dissolve every thing back into myself - where nothing exists accept me?