Humani Generis §41

⁴¹ For this reason, after mature reflexion and consideration before God, that We may not be wanting in Our sacred duty, We charge the Bishops and the Superiors General of Religious Orders, binding them most seriously in conscience, to take most diligent care that such opinions be not advanced in schools, in conferences or in writings of any kind, and that they be not taught in any manner whatsoever to the clergy or the faithful.