Obedience, the sure way. Unreserved obedience to whoever is in charge, the way of sanctity. Obedience in your apostolate, the only way: for, in a work of God, the spirit must be to obey or to leave.
This part of what you quoted doesn't appear to help your case. Calls for obedience to Christ I can at least understand (even though it might not always be easy to know what that entails). But calls for obedience to "whoever is in charge"? Do you really feel comfortable with that?
Do you? What about the US military? Are not enlisted men expected to be obedient to their superior officers?
True, an enlisted man can refuse an order that contradicts his conscience, or contest to higher authority an order he considers wrong, but he can never invent his own orders.
In a group like Opus Dei, (technically, a personal prelature in the Catholic Church of lay people who freely choose to be members), the situation is similar for members in living out their chosen apostolate.
This has always been the case for the various religious orders in the Church. What makes Opus Dei unique is that it is set up for working lay people.
Don't forget to read the following:
"Obedience in your apostolate, the only way: for, in a work of God, the spirit must be to obey or to leave."
Nobody is being asked for "blind" obedience. The author simply cherry-picked quotes out of context, changed words, etc. Jeez, you'd think he had an agenda or something....