Why do Christian's use symbols to show what the ‘Three in One ’ of God is like?

The ‘Three in One’ of God is difficult to explain because it is a wonderful mystery: For years people tried to find a way of showing what the ‘Three in One’ of God is like.

People began to draw triangles and shapes with three parts.

 
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But although these symbols are helpful, they don’t show everything about God. 

Christians believe that the important thing to remember is that there is one God, and God is three (hold up three fingers) in one (hold up one finger).