The most important lesson from Ezekiel's encounter is the veiled symbolism. The wheel within a wheel represents the gyroscope, the passage of time, the precession of the equinoxes, and the evolution of the soul from the beginning to the end. The Cherubim's heads actually represent the zodiac constellations, or the four markers of the Great Year, each lasting around 6,000 years.
The soul matures during this process and, in the end, reaches God for judgment, like a final test. Saints, monks, and enlightened people speed up the process of their soul's evolution. You can reach Heaven earlier.