Answer:
Truth is described as "the pure inmate of thy glowing breast" because it brings peace to the earth or any space that is founded on liberty.
Explanation:
This sonnet titled "To Liberty" (1796) was written by Mary Robinson. Mary Robinson, an English actress, poet, dramatist, novelist, and celebrity figure, describes truth as a resident, inmate, and companion of Liberty. Freedom or liberty births truth and is also accompanied in its journey by truth because truth flourishes amidst liberty. Without liberty, truth does not reign supreme. Even when it survives in an oppressive environment, it yearns for liberty to become stupendously fruitful.
In this context, it would be who. One would use whom to sound smart, but if used incorrectly, sounds ignorant.
May be there are 29 lines in that poem.
