There are more things in heaven and earth, Horatio,
Than are dreamt of in your philosophy. — Hamlet, Shakespeare
Forces unseen by our waking eyes pull and push us. Some unseen forces may be malevolent or parasitic, while others may be loving, symbiotic and encouraging our development. Other people influence us in ordinary ways, but also magical ways through their unexpressed inner thoughts and fantasies. You are also a magical influence in ways you may not realize, and therefore have an obligation to be aware of the energy and thought forms within that act as magical influences on the collective, and especially on those to whom you are connected by inner ties.
To read about an extraordinary case of malign magical influence see:
The Siren Call of Hungry Ghosts
For more on uncanny dark influence see the section “Mind Parasites” in the category section of this site.
For magical influence in the sense of manifestation see:
Magick with Tears