How do I center my origin (the orange dot) to the center of my grid?

So I want to use a mirror modifier for my cube so I have 2 cubes. The origin is set on the cube, as seen below:
How do I actually put the origin back in the center of the grid? I want to know so can I move my cube away from the center to see both cubes

Object > Apply > Location
Object > Set Origin > Origin to 3d Cursor

Object > Set Origin > Origin to 3D curser

Assuming your 3d curser is at the origin.
(Shift S to bring up the 3D curser to world origin option)

Awesome! That really helped.

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