I was wondering, is it because light is massless and thus it has a dual nature. Electrons are almost massless as well and thus behave in a similar fashion?

And this is just a wild thought, but maybe the sun is just a big hole whereby light/energy from another world, from heaven? or from another dimension is shining through to our dimension, our world. And the 'heaven' has unlimited amount of energy.... just a wild thought with no scientfic backing.....

Massless objects, those with pure energy will move at the speed of light. Those with mass will definitely be slower, and thus the speed of light is the limit of speed. Therefore, I think that it is simply a law of proportion, whereby the speed limit of an object is determine by its mass.