The best example is, us 3D beings, are capable to move around 3-dimensional axes (or 3D space in layman's terms), back-forth left-right up-down. Immeasurable speed on a very similar case, opens a new line of dimension to be explored; the time dimension. Which means them who can walk in the temporal dimension like in spatial dimension is qualified, them who can walk in a higher temporal dimension (say, 2D time) is qualified, despite being bounded to the spacetime themselves.