। ॥ १३ ॥
In plain words
Being sure about this comes from thinking hard about what someone who wishes you well has told you. It does not come from washing, or from giving things away, or from a hundred sessions of breathing exercises.
Close to the Sanskrit
Certainty about the matter is seen to come through inquiry into well-meant counsel — not by bathing, nor by giving, nor by a hundred restraints of the breath.