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.
But if he is poorer than your judgment, then he shall present himself before the priest, and the priest shall value him. The priest shall value him according to the ability of him who vowed.
They gave according to their ability to the treasure of the work, sixty one thousand drachmas of gold, and five thousand minas of silver, and one hundred priest's garments.
sons in whom was no blemish, but who were handsome and skillful in all wisdom; and who had knowledge and understanding, even those who were able to stand in the king's palace, and to whom they might teach the writing and the language of the Chaldeans.
And to one he gave five talents, to another two, and to another one; to each according to his ability. And he went abroad at once.
And the disciples, as any were prospered, determined each of them to send for ministry to those brothers who lived in Judea,