Every Hebrew letter is also a number.
300: Shin, which represents fire.
50: Nun, which represents fish.
30: Lamed, which represents a staff.
These letters represent the work that must be done in the physical body in order to achieve liberation.
The letter Shin relates to the trinity the 3 primary forces. It is the creative fire at the base of life. A power of creation inherent in every atom, a power we must harness and direct towards liberation.
The letter Nun is life in movement, the "fish" or living power of sexuality. By harnessing that force, we can achieve the "second birth." Jesus spoke often of the "living water."
The letter Lamed is the staff of Moses, rod of Aaron, which represents the creative fire of the letter shin raised upon a pole as a brazen serpent, like Moses did. The creative fire, raised up the spinal column. In the East, this is called kundalini.
Spiritual illumination is produced by an abundance of inner light. That light is radiated from the fire, the letter Shin, which represents the fundamental trinity of forces in all things.
The story of Noah represents an alchemical process of transmutation in which the base matter is purged and purified. All that is impure in us must die, while the purity must be developed and perfected.