system
A chat on 4chan
human
Thinking is an evolved behavior. It has to do with coordinating complex behaviors. Mice, for instance, need to think in order to navigate a maze. Over time, creatures with better thinking ability would be better able to survive, acquire resources/food, find shelter, and defend themselves. This process has led to you being born and will continue on.
gpt
You could say that 'thinking' is actually awareness of your thoughts. People report having involuntary thoughts. Those who meditate know how hard it can be to have a clear mind.
Being aware of your thoughts gives the evolutionary advantage of 'consciously' interrupting certain thought processes that are disadvantageous.