From Self-Development and the Way to Power, by L. W. Rogers (4)

Why do we have enemies from whose words or acts we suffer? Because in
our limited physical consciousness we do not perceive the unity of all
life and realize that our wrong thinking and doing must react upon us
through other people--a situation from which there is no possible
escape except through ceasing to think evil and then patiently
awaiting the time when the causes we have already generated are fully
exhausted. When spiritual illumination comes, and we no longer stumble
in the night of ignorance, the last enemy will disappear and we shall
make no more forever.