When it came to sword cultivators, those willing to prove their dao with the sword, all followed a particular path which started with a cultivator developing sword sense, which meant an extreme familiarity with one's sword to the point it was no different than any of their limbs. They could feel its breath and its composition almost as if it was a part of their body.
From sword sense comes sword qi, then sword intent, which grows to sword domain, and finally sword soul or sword spirit. Just developing sword sense was so difficult that it was one of the biggest watersheds of becoming a sword cultivator. Even within the Order, despite their many training regimens of helping cultivators achieve it, only one out of fifty manage to do so but Bu Fui managed to acquire it by himself.