I just throw it out and see what happens. If it sounds and feels right, then I continue.
If you let a bully come in your front yard, he'll be on your porch the next day and the day after that he'll rape your wife in your own bed.
Like water which can clearly mirror the sky and the trees only so long as its surface is undisturbed, the mind can only reflect the true image of the Self when it is tranquil and wholly relaxed.