Why do you write in a diary?
Options:
- not to forget
- have to say
- express yourself
- thoughts
- move fingers
Let's think carefully first. Step-by-step reasoning process:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
It is a good habit to write a diary. You write in a diary because you want to express yourself. So the final answer is express yourself.