We may deceive others if it serves our purpose, but we never lie to our fellow members of the Order.
We never lie to our fellow members of the Order because we believe that complete information is essential for our effectiveness.
By analogy:
We must be prepared for anything. Even if everything goes completely wrong, the battlefield is no place for panic. Even in such situations, it is necessary to remain calm and act according to the situation.
We must be prepared for anything. The battlefield is no place for doubt or hesitation. It is always necessary to remain calm and act according to the situation, taking into account the pre-planned tactics.
Overall, it's good. Perhaps it could be a bit longer; maybe include something about the principle of organization, for example.