The rhyme scheme of the poem is – ab, aa, bc, bcb.

This rhyme scheme brings out the contrasting ideas very beautifully: as first line’s word- ‘fire’ rhymes with third and fourth line’s word-desire, fire.

Third line’s word – ‘ice’ rhymes with fifth line’s – twice.

Sixth line’s word – ‘hate’ rhymes with eight line’s – great.

Ice- rhymes with suffice.

Both ‘fire’ and ‘ice’ are different ideas. In the poem, these words are used beautifully.