Adler also trained actors' sensory imagination to help make the characters' experiences more vivid. She believed that mastery of the physical and vocal aspects of acting was necessary for the actor to command the stage, and that all body language should be carefully crafted and voices need to be clear and expressive. She often referred to this as an actor's "size" or "worthiness of the stage". Her biggest mantra was perhaps "in your choices lies your talent", and she encouraged actors to find the most grand character interpretation possible in a scene; another favorite phrase of hers regarding this was "don't be boring".