There is no other way of controlling the mind except as prescribed in the books like the Gita, drawing in and turning the mind inward as often as it strays or goes outward, and fixing it in the Self. Of course it will not be easy to do it. It will come only with practice or sadhana.
God illumines the mind and shines within it. One cannot know God by means of the mind. One can but turn the mind inwards and merge it in God.
