The message in these last two lines is that hope, unlike most things in this world, does not need payment for its services. In order to be hopeful, one does not need to give up anything. Hope exists in the darkest times and the brightest. It is a force that will always exist, for those who need it most, without asking for anything in return.

The duality of "chillest land" and "strangest sea" is specifically used to show that no matter where one is, hope is always present. Hope is not exclusive to one group of people, or even one species, but rather exists everywhere. Hope is universal. It is a bird that soars around the world, inspiring everything it comes into contact with.

I see dual meaning in this. The idea of warmth can refer to hope itself, fueling passion within people, which is often represented as a flame. Therefore, hope keeps people warm by igniting their passion. However, it can also be taken literally, because passion and hope can be a driving force for people to take care of themselves. By holding hope, someone who may be in need can potentially get help and be able to get back on their feet. Hope can allow people to work towards a goal, which can be used to obtain money, and literally keep them warm by paying the heating bill.

This reinforces and confirms the idea of hope being a bird, specifically one with the capability of flight.

"Sore" can mean "upset and angry." This is likely the case, rather than a storm being sore in the sense of experiencing physical pain. Killing a bird (in this case, hope) must be very distressing.

A gale can refer to a burst of sound, which provides association to the idea of music, but can also refer to a strong wind, referencing the idea of birds in flight. Additionally, "gale" can possibly be a shortened version of "nightingale", which are known for their songs.

This reminds me of a video I saw online of Californians being surprised about being able to hear lots of birds due to the lack of noise from the quarantine. That's very interesting to me, because it emphasizes the fact of the beauty that birds represent being ever-present, even in times of great distress, like now.

We also associate music with birds, or a birdsong. Most birds don't have the ability to speak, and a birdsong consists of a series of chirps that we perceive as music. Therefore, it is a tune without words.

Another reference to birds. "Perches" rather than "exists" or another two-syllable word. This is because a perch is where a bird rests, which goes back to the idea of hope as a bird.

I think it's really interesting that the idea of feathers instantly brings images of freedom and happiness associated with flight, when feathers themselves don't necessarily mean that the thing that possesses those feathers is capable of flight. Think about it - a penguin has feathers, but is unable to fly; the same is true for ostriches and other birds. But feathers are a symbol of freedom and happiness, because they conjure images of birds in flight, soaring above the world.