। ॥ १०० ॥
In plain words
Śama — the mind gone quiet — succeeds only when both of its limbs are in place, and by no other route. The limb that comes before it is a fierce dispassion; the limbs that come after are dama and the rest.
Close to the Sanskrit
When the prior and the subsequent limbs are present, śama is accomplished, not otherwise. Intense dispassion is the prior limb; the subsequent limb is dama and the rest.