Widargelt's knowledge, from what I understand of the MNK job quests, seem to imply that the only time a monk taps into latent surrounding aetheric energies is when they are communing with/attuning to/meditating on/tapping into a "land," otherwise known as a particular locale. A prerequisite for said lands is that they have to have been sites of former battles or some such; I think the implication there is that there needs to have been some amount of death to result in a surplus of aether for that area. This is "the spirit of the fight lingers"; it's aether left behind from people dying and/or expending aether. A monk, in communing with the land, takes hold of that aether the way Louisoux took hold of the aether around him at Carteneau. The difference is in how it is used: a monk allows that energy to flow into him or her, and that excess effectively aids in opening the floodgates/locks that restrict a normal person from accessing chakra.
It's implied that, at all other times, a monk's expression of power is internalized use of internal energy.
Again, I cite:
http://xivdb.com/?quest/66597/Brother-fr...her-Mother
It's implied that, at all other times, a monk's expression of power is internalized use of internal energy.
Again, I cite:
http://xivdb.com/?quest/66597/Brother-fr...her-Mother
Quote:The fist is our weapon. With it, we put down our enemies. The energy within us moves the fist. The chakra is the seat of that energy.