This can be perceived in three ways:
Physically it interferes with the free passage of blood through the veins and tubes and so produces various diseases - arthritis, rheumatism, angina and all forms of sluggishness.
Mentally it inhibits the passage of thought vibrations into the nerves, tends to sarcasm and bitterness in speech, and gross selfishness in outlooks upon life.
Spiritually it kills all desire for love, growth and expansion. The person recognizes no love or kindness either in oneself or another, and without necessarily giving way to hate, leaves no room for the expression of spirit. So this man or woman stands in his or her own light, and there is a tightening up of all tendencies and functions - bringing decay and death, due to the absences of life. Even cancer and other such diseases can destroy the body because there is no room for the higher aspects of life and no protection against evil influences from within or without