It is not nature that humans cannot command, but themselves.
that所引导的从句是主语从句,还是定语从句?
这是强调句型,不存在主语从句或宾语从句。but后的第二个分句省略了相应的成分。
It is not nature that humans cannot command, but themselves.
= It is not nature that humans cannot command, but (it is) themselves that they cannot command.
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