enlightenment, perceive, discern, realize, understand
忢 centers on a mind that sees clearly: perceiving, discerning, realizing, and understanding. The enlightenment sense is a deeper, more complete form of that same mental clarity.
忢 combines 五 (five) and 心 (heart/mind). The exact historical development is uncertain, but it likely expresses a mind that has grasped the five senses or elements, leading to understanding.
Five 五 senses feed into the heart/mind 心, and when they all align, you perceive and understand clearly.
For ゴ, imagine a moment of enlightenment when you suddenly 'go' from confusion to understanding: go -> ゴ, and your mind 心 makes sense of the five 五 inputs.