One of the most interesting things of MLP is their element rainbow spell. 

Which brings me to the subject of this blog the meaning of the rainbow.

The colors of the rainbow represent the spiritual and physical chakra system.

For example red represents the physical or base physical chakra system.

Like wise, in the opposite end of the rainbow the color of indigo represents the God head or connection to one's higher self and the spiritual world.

And even beyond that there is also another of the masculine and feminine energy genders as united.

Note that masculine and feminine are NOT male and female despite what society may make you think.

They are two energies that have the paradox of always working together despite being polar opposites of each other: spiritual with physical, creation energy with destructive energy.

I bring this up simply to help in understanding that the point of the rainbow is how all these details, energies etc by themselves would be considered odd if not perhaps even ugly but when working together create something of beauty, wonder etc.

This rainbow system doesn't just stop with the human body and can come in more macro forms as well such unity of the elements:air, earth , fire etc.

The MLP:FIM is just a very good example of the unity of their own unique chakra  magic system. 

And much like as seen when Discord messes with the mane six when one or more points on this chakra system it doesn't work correctly and can become corrupted.

That corruption can cause things like fear: egotism, pain etc.

Prime examples of a masculine corrupted energy system would be Nightmare Moon and Sombra wherein their energy was so dark they were working to stop any all feminine energy creating authoritarian viewpoints on their subjects.

No creativity, no joy etc everything becomes rational and direct there's no love or empathy when this happens.

Likewise an imbalance on the other end can also be a very bad thing.

two prime examples of overbearing energy can be found with Fluttershy and Starlight Glimmer.

in the Fluttershy's case the time she had the breezies and became far too overprotective of them to the point where she unintentionally began to block their true path and in the case of Starlight she refused to allow ANY darkness into her small village as its leader.

In both the case of Fluttershy and Starlight Glimmer what happens is you end up with issues of laziness, ignorance, weakness etc.

the villagers lost their sense of self appreciation and became mindless drones for Starlight. In the case of the breezies they were starting to loose their minds and spirits...

However when combined correctly such as Princesses Celestia and Luna working for the unity of day and night you get a working system that allows for not only an appreciation of self but of  chance for understanding of others as well.

 Now, the chakra system is of course a part of the masculine and feminine energies and those energies are likewise a part of the rainbow chakra system.

Neither exists without the other one and all must work together in harmony.