The speaker of snow-bound view memory as something beautiful that he should alwyas hold into, which remind him about what he cherish in life.
This is very similar to lily who lay on top of ponds, who provide esthetical value and a place for others to hold on to.
A simple trick to summarize the three main categories of author's purpose is to use the acronym PIE,
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1. A meeting, especially one that is unplanned, unexpected, or brief: a chance encounter in the park.
2. A hostile or adversarial confrontation: a tense naval encounter.
So number 1