One can no more keep the mind from returning to an idea than the sea from returning to a shore. For a sailor, this is called the tide; in the case of the guilty it is called remorse. God stirs up the soul as well as the ocean.
I complained to Waki' about the weakness of my memorisation,
So he instructed me to abandon disobedience;
He informed me that knowledge is a light,
And the light of Allah is not given to a sinner.
You have a gift that only you can give the world - that's the whole reason you're on the planet. Use your precious energy to build a magnificent life that really is attainable. The miracle of your existence calls for celebration every day.