। ॥ ६८ ॥
In plain words
Two sections — one of action, one of knowledge — and they differ on both counts: who is fit for them, and what they are about. That being so, how could these two ever fit together, one as the limb and the other as the body?
Close to the Sanskrit
The two sections, consisting respectively of action and of knowledge, are ones whose qualified person and whose subject matter differ. This being so, how does a relation of limb and principal between these two, mutually, fit together?