Suppose there are three water fountains of different heights:
Which one would I choose?
Logically, I would travel toward the one that suits my height. If I were short I would go towards the short fountain. If I were tall I would gravitate towards the tall one. Whichever fountain makes the most sense for me ergonomically I will approach.
If I examine this process closely it appears that this decision did not arise from me. Rather, it was influenced by a prior condition: my height. It was only the most logically coherent decision to approach the water fountain that gave me the most comfortability.
In some sense, my mind followed the tram lines that logic set forth before me. It would not make sense to walk towards a water fountain that was too tall if there were other, more apt fountains available. And I cannot think of an action that I do that does not travel on such tram lines. I sleep because I am exhausted. I blink because my eyes get dry. Every action appears to be superseded by a prior condition that necessitated such an action.
If I am not thirsty I could just dismiss this whole experiment. I can protest that I would go to the short water fountain even though I am tall, just to assert my free will. But this too is based on a prior condition--a desire to negate the experiment and convince myself of autonomy [perhaps stemming from a fear of enlightenment].
This suggests that I am not the navigator of my existence. Rather, logic itself is. The substrate of logic is the mechanism by which actions are conducted. I did not walk to the water fountain of my choosing. Rather, substrates of reality that transcend my personal self directed my body towards the right water fountain, for reasons of optimization and adaptation. Logic and reason resolved themselves into a pathway leading towards a water fountain based on something I personally did not dictate.
Logic, Reason, and Mathematics rob me of my alleged free will. I have no choice but to follow along. I cannot not see how 1=1=2. And once I accept this axiom, I can only follow along with what mathematics reveals to me. I do not choose what maths says. I do not create nor dictate it. It would be a farce to disagree with mathematics. My consciousness understands its course without control nor effort.
So perhaps logic is not man-made. Rather, man is logic-made and logic-bound. I do not "have" logic. I grew out of it. All my actions are an expression of logic itself. It is an a priori framework of being that is self-generating, self-referential, self-governing, self-maintaining, self-blossoming, and eternal.