Definition:
A "theological doctrine" is a set of beliefs or teachings that a religious group holds to be true. These beliefs help guide the actions and practices of the group and explain their understanding of God, the universe, and moral values.
"To take something on faith": This means to believe something without needing proof, which is often related to theological doctrines.
"To hold fast to one's beliefs": This means to strongly maintain one's beliefs or doctrines, often in the face of opposition.
"Theological doctrine" refers to the beliefs and teachings of a religious group. It helps define how followers understand their faith and guides their behavior.