A Form, by Plato’s reckoning, is eternal, perfect and unchanging, unlike the images or shadows of Forms that we see in the world of Appearances. In the material world, nothing is perfect, everything changes and eventually everything dies. However, Plato was a dualist, so he believed that as well as our mortal body we also have an immortal soul which existed before and will exist after our time in this world of appearances. The place where our souls resided before we were born and will return to when we die is the realm of the Forms. This, according to Plato explains why we have an innate (though dim) recollection of what Forms are, and why we can recognize things like beauty and justice without being taught.
Plato believed that the true philosopher was the one who knew about the Forms and was trying to appreciate and understand the Form of the Good. The Form of the Good is the highest in Plato’s hierarchy of Forms, the highest reality. It is the source and the unity of all the other Forms, and illuminates them so that if one has understanding of the Form of the Good, they have understanding of all the Forms. In Plato’s analogy of the Cave, the Good is represented by the Sun, which is the source of all the objects that the escaped prisoner finds above ground. The Sun makes all the things above ground visible, just like the Form of the Good makes all the other Forms understandable.
The Analogy of the Sun by Plato tells us more about the Form of the Good. Plato believed that sight was the “most