Spirit
The narrator gives an idea of confidence in an indirect way. He motivates readers to live life without any critical self-analyzing. Being a human doesn't mean to live in guilt or pity; it's a way to make life better with positivity and consciousness.
A Bird
Birds have a short life. In the limited periods of their life, they never complain about anything, though this idea may seem a bit tricky to think and question how the narrator surely talks about the animal's life, how they feel. Though on the positive side, he still makes a birdie a sign of free life, free from any anxiety, depression, guilt, or self-awareness.
Death
In this short poem, the narrator equally talks about life and death. A frozen bird is a sign of death. The ending comes to all. What matters is how we deal with it. In the poem, the bird is not afraid of death and accepts it how it comes.
Dilemma
In the poem, the narrator asserts human complexity of living in the past and future. He talks how they are never able to concentrate on the present and live in the insignificance of self-pity. The poem gives a message to live in imperfection without any thought in the future.
Fear
A human being is always afraid of society and their thoughts about himself. The poem encourages humans to be healthy not to create criticism about themselves out of fear, as they never know what others think. Life should be lived with a positive mindset.