If you allow your thinking to be wasted

"If you allow your thinking to be wasted, day in, day out, on all
kinds of trivialities, do not be surprised if you come up against
great difficulties, when you come to meditate and connect with
the light. So many people complain, ‘Oh, it is so difficult to
concentrate on a spiritual subject! I am constantly invaded by
all kind of thoughts and feelings that take me elsewhere.’ And
there have even been dramatic cases of this. In meditation you
come face to face with yourself, and some people are so
overwhelmed and caught unawares by the nature of the impressions
and currents moving through them, they imagine these are being
sent to them by other people, who are ill-intentioned and out to
harm them. But attributing the turmoil you feel to an external
cause solves nothing.
Because of the way people lead their lives, they create within
themselves chaotic thoughts and feelings, which they then
increase and magnify. In the normal course of life, they may not
realize this; it is only when at last they fall silent and want
to stop and connect to the light that they feel invaded by all
kinds of undesirable presences. But they should not delude
themselves: they have attracted them. So begin by looking within
for the cause of your difficulties, and work to control your
thoughts: you will eventually get the better of them."

Omraam Mikhaël Aïvanhov