Whether the vow of obedience is the chief of the three religious vows?

Objections

Objection 1 : It would seem that the vow of obedience is not the chief of the three religious vows. For the perfection of the religious life was inaugurated by Christ. Now Christ gave a special counsel of poverty; whereas He is not stated to have given a special counsel of obedience. Therefore the vow of poverty is greater than the vow of obedience.
Objection 2 : Further, it is written (Ecclus. 26:20) that "no price is worthy of a continent soul." Now the vow of that which is more worthy is itself more excellent. Therefore the vow of continence is more excellent than the vow of obedience.
Objection 3 : Further, the greater a vow the more indispensable it would seem to be. Now the vows of poverty and continence "are so inseparable from the monastic rule, that not even the Sovereign Pontiff can allow them to be broken," according to a Decretal (De Statu Monach., cap. Cum ad monasterium): yet he can dispense a religious from obeying his superior. Therefore it would seem that the vow of obedience is less than the vow of poverty and continence.