This aspect is a seat of inner tensions. The tension of the square gives us motivation. Squares are dynamic aspects that give us the drive to succeed. What begins as an inner problem is overcome or accepted, and then becomes a door to understanding.
It is important to understand that the Sun rules the identity, ego, individuality, power and pride, while Pluto rules transformation through destruction, only to end up in reconstruction. Pluto is powerful and behaves like plutonium, where it completely destroys only to rebuild anew. Pluto levels one thing to cause something else to rise up out of the ashes, just like the phoenix-rising arises from the ashes. Pluto destructs in order to reconstruct and there is where the transformation takes place.
This is explosive and unpredictable energy that creates trouble in controlling our emotions. It is powerful, which makes is good for rising to challenges. This aspect teaches how to learn to compromise.