ableness

[…]not that we are ſufficient of oure ſelues to thynke eny thinge, as of oure ſelues, but oure ableneſſe commeth of God,[…]

For [Peter] Morriss abilities are the capacities we have which we may use under particular conditions (power in a generic sense). Ablenesses are the abilities when those particular conditions obtain (power in a particular sense).