There are 4  gospels - Matthew₁ Mark₂ Luke₃ John₄
The 4th is also different than the other 3.

There are 4 dimensions:
Ephesians 3:18 KJV
May be able to comprehend with all saints what is the breadth₁, and length₂, and depth₃, and height₄;
Breadth, length and depth (an alternative word for height) are all 3 dimensional but the 4th is different.