The chief device of ancient Hebrew Biblical poetry , including many of the psalms , was parallelism , a rhetorical structure in which successive lines reflected each other in grammatical structure, sound structure, notional content, or all three. Parallelism lent itself to antiphonal or call-and-response performance, which could also be reinforced by intonation . Thus, Biblical poetry relies much less on metrical feet to create rhythm, but instead creates rhythm based on much larger sound units of lines, phrases and sentences.  Some classical poetry forms, such as Venpa of the Tamil language , had rigid grammars (to the point that they could be expressed as a context-free grammar ) which ensured a rhythm.  In Chinese poetry , tones as well as stresses create rhythm. Classical Chinese poetics identifies four tones : the level tone, rising tone, departing tone, and entering tone . 
The thesis statement serves as the foundation of any essay. Feature it prominently in the introduction, as the final sentence. The perspective you chose to take in the introduction drives the thesis statement. Consider your main idea and why it is important. For example, what influence did historical events have on the poem and why are they significant? Alternately, you might choose to answer the question of what the use of personification adds to the poem and why is it significant. To create a strong thesis statement, answer the questions you want to address in one assertive sentence.