Final answer:
The philosophy actors must develop for a cohesive performance is one of unity or togetherness, and congruence is the term for matching one's self-perception with their actions.
Step-by-step explanation:
In theatre, actors collaborate closely, and over time they must develop a philosophy of unity or togetherness in order to create a cohesive performance. This philosophy is essential as it influences not only the dynamics among actors but also the interaction with the audience, who plays a vital role in the live theatrical experience. Consistency in performance is key to a believable and engaging production, while the actors' connection to the physical and emotional demands of their roles is rooted in trust and a sense of community. The idea that people's ideas about themselves should match their actions is termed congruence, which reflects how an actor must align their inner emotions with their outward expressions to fully embody a character. Theatre also fosters collaboration, such as the enduring partnerships between directors and playwrights, exemplified by the acclaimed works of Lin Manuel Miranda and the historical synergy between Tennessee Williams and Elia Kazan.