Answer:
By studying his thoughts
He could think something but not show it in any way, therefore thoughts
I am almost positive the answer is stasis.
The answer is: structure.
The division of a poem has to do with its structure. It is written in stanzas and lines. The use of rhythm, the lenght, the placement and the grouping of the lines and the stanzas are also important to divide the poem and to express the ideas the writer wants to.
What is your question
Vast means too large to see and trunk less means Legs without a body. If referring to problems that is a figurative way of saying it is too large of a problem and being trunkless means no substance. And too many little things building up to too many things.
Lots of interpretations above without a question or context. Sorry I wasn’t much more of a help