The light of God shines as the sun at noon day; but our passions, like so many thick clouds opposed to it, are the reason that we cannot perceive it. Love, hatred, fear, hope, grief, joy, and other vicious passions filling our soul, blind it in such a manner that it sees nothing but what is sensible and suitable to it; refusing all that is contrary to its own inclinations and being thus filled with itself, it is not capable of receiving the light of God. — Bourignon's Light in Darkness, p. 14.
Now there can be no question, that Inward Recollection secures the soul in a most remarkable degree, from inordinate passions. Such passions cannot well flourish, with the eye of God distinctly looking upon them. And accordingly, under such circumstances, the illuminative suggestions of the Holy Spirit readily enter the mind, and operate in it, and reveal the divine will. So that he, who walks in recollection, may reasonably expect to walk in the light of true knowledge and of a divine guidance.
And not only this, Inward Recollection tends to concentrate, and consequently to strengthen very much the action of the intellectual powers. It does this, in part, and indirectly, by disburdening the mind of those wandering thoughts and unnecessary cares and excitements, which, with scarcely any exception, overrun the minds of those who do not live in a recollected state.
— edited from The Interior or Hidden Life (2nd Edition, 1844) Part 3, Chapter 7.