Ramban, commentary on Exodus 35:21

“And everyone who excelled in ability and everyone whose heart was stirred came, bringing to the Lord their offering for the work of the Tent of Meeting and for all its service and for the sacral vestments.” The “stirring of the heart” is being said about those who are doing the work, because we don’t find [in the description in the text] among those who donate this stirring of the heart, rather it says they were generous. And the reason it says their hearts were stirred up is to imply the arousing of their capacity to undertake the work. For none had ever learnt these skills before from any teacher, nor had ever practiced them before. But each one discovered their own natural talent or aptitude for the task, each heart rising as it were to the Divine challenge, enabling each person to come into Moses’ presence and say “I can do it”... the text thus observes that everyone whose hearts lifted them up - everyone who had confidence in their own power to undertake the work came along to offer their services, while those whom the spirit made willing brought sacrifices. [Translation by Shuli Passow. Edited for gender neutrality]