Keep faith: the old man's persistence and perseverance are the key to his victory over the dilemma, and they convey the importance of keeping faith to people.
The meaning of life: Through the struggle with the big marlin, the old man explored the meaning and value of life, and taught people to be full of love for their own life.
Dignity and Victory: Although the old man lost the fruits of victory he hoped, he maintained his dignity and optimism, which shows that victory is not everything, but more importantly how to maintain dignity in the face of adversity.
Loneliness and Friendship: The old man struggles alone in the ocean, but his friendship with the little boy Manuel gives him strength and support, emphasizing the importance of interpersonal relationships.
Nature and Man: The novel explores the relationship between the power of nature and the efforts of human beings, through the struggle between the elderly and the big marlin, and the awe and respect for nature.
Confronting against fate: The old man represents the spirit of human beings to fight against fate and challenge difficulties. His courage and determination inspire people to meet the challenges in life.
Inner power: The novel reveals that the deep strength and will of a person's heart is the key to overcoming adversity. As long as you have a firm belief, you can overcome any difficulty.
