The effect of any thought is quite precise and definite and set into motion because of the nature of its own electromagnetic identity. The physical body operates within certain electromagnetic patterns and is adversely affected by others. These effects change the actual molecular structure of the cells, for better or worse, and because of the laws of attraction, habitual patterns will operate. A destructive thought, then, is dangerous not only to the present state of the organism, but is also dangerous in terms of the 'future.'

p. 238 - Seth, Dreams & Projections of Consciousness, (1986)