Contingit unius potentiae esse habitus plures quia subiectum habitus est potentia passiva, ut supra dictum est; potentia enim activa tantum non est alicuius habitus subiectum, ut ex supradictis patet.
There may be several habits in one power because the subject of a habit is a passive power, as stated above (q51 a2); for it is only an active power that cannot be the subject of a habit, as was clearly shown above (q51 a2).