How do bad decisions affect your life?

The spirit is a mirror that reflects inward emotions.

The world should learn this important fact—

Licentiousness, selfishness and wrongdoing may be indulged in to the extent that the spirit becomes darkened and dwarfed, and when its transit to spirit life is effected, its true character is revealed.

A seed if planted in a darkened room where the genial sunshine is never allowed to enter, though watered and tended with scrupulous care, only presents a skeleton, as it were of what it would have been had it been allowed free access to the illuminated atmosphere. 

Deeds of benevolence, acts of tender love and charity and true devotion to those around you act upon the indwelling spirit, expanding it into grand proportions, the same as sunlight and moisture will a tiny plant.

Good deeds illuminate the soul—selfishness darkens it.

Your life in the spirit is just what you made it.

While on earth, you adapt yourself for a particular place in the spirit realms.

The pathway to the spirit realms leads you to the locality where you can reap what you have sowed—or feel the presence of your own acts.

That which a (hu)man sows, he shall reap is a law of the universe!

Action and reaction are equal.

If you render anyone's life desolate—if you make him wretched and miserable, the action and reaction will be equal, and you will receive, in the desolation experienced in your own person, just what you meted out to him.

The natural tendency of selfishness is to paralyse and contract the spirit until it becomes a mere pigmy in dimension, rendering its appearance more hideous, deformed and darkened spiritual body than it otherwise would have been. 

Impress on the children of earth this fact—whatsoever they sow they shall reap, and you will do more to moralise and refine them than in any other way. 

The outer covering of the soul of the indwelling conscious self is composed exactly of such material as the sphere to which it gravitates. 

While on earth, your physical organisation is evolved from the various elements and connected therewith is the indwelling spirit. 

Acts of licentiousness, intense selfishness, and a life in the purlieus of vice modify the character and texture of the latter and prepare it for a sphere corresponding with the life led here.

Every act in life has a well-defined effect on the spirit.

I say emphatically that every truly honest work—or act of charity that cheers a saddened heart has an effect on the indwelling spirit, modifying its texture, just the same as the impressions made on the mind of the mother affect her embryonic child. This is a sublime fact.

―Lucretus, Encyclopaedia of Death and Life in the Spirit World