Kindness reverberates

Each small act of kindness reverberates across
great distances and spans of time, affecting lives
unknown to the one whose generous spirit was the
source of the good echo, because kindness is passed
on and grows each time it is passed, until a simple
courtesy becomes an act of selfless courage years
later and far away.  Likewise, each small meanness,
each expression of hatred, each act of evil.

– from Dean Koontz’s From The Corner Of His Eye.