She believed that she was an 'instrument' of God. [=she believed that God was using her to do things; she believed that God was acting through her]
Part of her training as a pilot involved learning to fly by 'instruments'. [=learning to fly only by looking at the instruments in the airplane]
Movies can be useful 'instruments' of social change. [=movies can be used to cause social change]
(..) Inflicting pain. You see these butterflies? Beneath their beautiful wings is a whole array of instruments used to inflict agony during coitus. The connection between pain and pleasure is far more common than you think. (..)2018 TvShow: The Alienist Title: These Bloody Thoughts Season: 1 Episode 4