In the opening stanza of Maya Angelou's "Still I Rise", the syllables go 9 / 7 / 9 / 6. The second verse goes 8 / 7 / 9 / 7. All of these are within two or three syllables of each other, and relatively long.
The third verse, however, goes 6 / 7 / 6 / 3:
Just like moons and like suns,
With the certainty of tides,
Just like hopes springing high,
Still I'll rise.
This last line breaks the patterns - it's shorter than other line in the poem so far (and for most of the rest of the poem), literally half as long as the previous shortest line (6 syllables).
How does this affect our reading? What effect does breaking the pattern like this have?