Imagine a x-y-diagram, so 2 axis.
Now, if you just move on the y axis without any movement in the x axis, your endpoint will be higher than if you move a little bit in the x-axis as well, assuming your amount of total movement has to stay the same.
Now imagine our 3-dimensional universe (x,y,z) with the forth dimension being time.
If you move in time (so on the imaginary 4th axis) you can move less on the other 3 axis (x,y,z).
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