Another sentence.Would you Please tell me the meaning?

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Hope is the thing with feathers
And sore must be the storm
That could abash the little bird
That kept so many warm.

The first line, "Hope is the thing with feathers" begins the construction of a metaphor which describes hope as a bird. The second line "And sore must be the storm" means that a storm must be exceptionally powerful. The third line, "That could abash the little bird" continues the second line, and says that only an exceptionally powerful storm could make the little bird (Hope) uneasy or embarrassed (abash is a verb meaning to make uneasy, uncomfortable or embarrassed). The fourth line, "That kept so many warm" means that Hope, the little bird, has been a comfort to many people.

So, the four lines combined say that Hope is a little bird which has kept many people warm (safe, comfortable, hopeful, trusting in the future), and that only a very powerful storm (also a metaphor, it means only a very dire or dangerous circumstance) that would embarrass that little bird, Hope. To condense the meaning even further, it is saying that only the most dangerous, the most extreme of circumstances can make someone abandon hope.