Extract the main theme from the following text:

"The world is a big place, full of challenges and opportunities. Every day, we all have the chance to make a difference, no matter how small."
The main theme of the text is the idea of the world offering challenges and opportunities, and the potential for individuals to make a difference.
Complete the following task based on the instruction and optional input provided.### Instruction:
Extract the main theme from the following text:

"The world is a big place, full of challenges and opportunities. Every day, we all have the chance to make a difference, no matter how small."

### Output:
The main theme of the text is the idea of the world offering challenges and opportunities, and the potential for individuals to make a difference.