Are these senteences OK?

I'm trying to say; Generally, people harm themselves more with their actions.

If I say;
No one can do evil that a person does to themselves.
No one can do as much harm to a person as they do to themselves.

Question

Are these senteences OK?

I'm trying to say; Generally, people harm themselves more with their actions.

If I say;
No one can do evil that a person does to themselves.
No one can do as much harm to a person as they do to themselves.

Answer

Perhaps the following:

There’s no greater harm than the one we cause to ourselves.

Answer

If you're talking from a spiritual/karma point of view:
When you harm others you are only hurting yourself.
I hope that helps, Pelin.

Answer

The first don't make much sense to me. The second is a bit awkward but does get the idea across. I think a better way to express the idea might be "When doing evil a person harms themself more than those they seek to harm." or perhaps "In harming others we do more harm to ourselves than we do to others."