"Whoever wishes to make progress in perfection should use particular diligence in not allowing himself to be led away by his passions, which destroy with one hand the spiritual edifice which is rising by the labors of the other. But to succeed well in this, resistance should be begun while the passions are yet weak; for after they are thoroughly rooted and grown up, there is scarcely any remedy."

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To the shepherds alone was given all power to teach, to judge, to direct; on the faithful was imposed the duty of following their teaching, of submitting with docility to their judgment, and of allowing themselves to be governed, corrected, and guided by them in the way of salvation. Thus, it is an absolute necessity for the simple faithful to submit in mind and heart to their own pastors, and for the latter to submit with them to the Head and Supreme Pastor.

— Pope Leo XIII