Which thought occupied Pi's mind throughout his struggles

Throughout his struggles in "Life of Pi" by Yann Martel, Pi Patel's mind is occupied by several recurring thoughts and concerns:

1. Survival: The most immediate and constant thought occupying Pi's mind is survival. He is constantly thinking about how to find food and fresh water, how to protect himself from Richard Parker, the Bengal tiger sharing his lifeboat, and how to navigate and hopefully reach land.

2. Faith: Pi's deep spirituality and belief in God is a recurring theme in the book. Despite his dire circumstances, Pi often turns to his faith for comfort and guidance. He prays regularly and interprets his experiences through a spiritual lens.

3. Richard Parker: Much of Pi's mental energy is spent on the tiger, Richard Parker. He is constantly aware of the tiger's presence and spends a lot of time thinking about how to coexist with him on the lifeboat without getting attacked.

4. Hope of Rescue: Pi is always on the lookout for ships or planes that might rescue him. The thought of being rescued and returning to civilization occupies his mind and keeps his hope alive.

5. Loneliness and Despair: Pi often grapples with feelings of loneliness and despair. Being the sole human survivor of the shipwreck, he misses his family and often reflects on his loss.

6. Rationalizing His Situation: Pi spends a lot of time trying to make sense of his situation. He uses reason and logic to devise survival strategies and to understand the behaviors of Richard Parker.

These thoughts and concerns occupy Pi's mind throughout his ordeal, shaping his actions and his understanding of his extraordinary circumstances.