I took the shortcut to "realize" (not to "understand") my morality. 

I would like to challenge your view that we humans are just biological machines. I am an organism. I would state that organisms were there long before machines arose. We didn't know of machines before they weren't invented. But, unfortunately, since than we widely put on a mechanistic notion of the world. 

The difference is quite significant. A machine is made out of bits and pieces, an organism grows and is changing every single day from birth to death - there is nothing added to the organism. That's fundamental. As I gave birth to a child this is obvious to me. 

Why is it important?   

In the realization that I as a creature grow organically I must admit that I deeply depend on other organisms here on earth. I am interconnected to them. That means what happens to the bee or the fish or the bear, happens to me as well. Also I depend on other humans. 

When I see them mostly as biological machines, I treat them as machines, to put it simply. I then may believe in mechanical treatment, in fixing organic problems just as I fix a broken clutch. As a specialist in surgery I may know everything about the human heart or bladder but the complexity of the human body and mind I cannot comprehend to the fullest. As I am not able to full realization I must have something to rely on. 

This, for me, is ethics. 

To build up strong ethics, I need a source where I get them from. My existence is standing on the shoulders of others. Already ethics were formulated and given to the world. I "just" have to put them into my daily habits. Because in theory I already know that I shouldn't harm or kill other living beings, I should be authentic (truthful), not badmouthing about others, not stealing, not betraying. 

Have you ever linked ethics to your daily actions, reactions and thoughts? 

I try and must say: that is the most difficult thing. Being honest for a single day, not betraying this principles is just as difficult (and exiting!) as giving birth to a baby. 

Make the experiment and pick just one of the premisses.

Would that be a revelation?