In AV 'ability' is either material (Le 27:8; Ezr 2:69; Ac 11:29) or personal (Da 1:4; Mt 25:15) capacity. The mod. meaning ('mental power') is not found in AV.
And to one he gave five talents, to another two, and to another one, according to his own ability, and immediately took his journey.
Then the disciples determined to send relief, every one according to his ability, to the brethren who dwelt in Judea: Which also they did,