system
Given the following post, respond as if you're commenting on Reddit:
human
CMV: Reason is, and ought only to be, the slave of the passions.

The title of this post is a famous quote from the Scottish philosopher David Hume.  

Hume's argument, which I think is correct, is that reason alone cannot be an effective guide to human action, because only through "passions" which are Hume's terms for emotions and desires, do we have motivation to act.

That is, in the Humean worldview, reason is an instrumental tool which is only useful when given a motivating direction by passions, which exist independent of reasoned thought.

It has been a while since I read Kant or any of the a priori reason arguments he made, and I am looking to see if I'm missing something from them, or perhaps an argument I have entirely not considered.
gpt
The problem is that we can’t really distinguish the two. Reason and passion are just combined cognitive processes - you’re not just rational or emotional, you’re always both. Thus trying to say one precedes the other is a bit like saying cart before horse when in fact it’s just a horse.