To fully appreciate the natural world it is important to understand the fundamental forces comprising its immutable laws. There are four forces in all: gravity, electromagnetism, the "weak force", and the "strong force". But why are there four, and why do they differ fundamentally in character? Why is there not a single force which energizes the universe? Einstein spent his life in search of an elementary picture of the cosmos, a single underlying principle. "What really interests me," he wrote, "is whether God had nay choice in the creation of the universe." Einstein also observed, "...God is subtle, but malicious He is not." There must be in nature a certain beauty and symmetry which, while difficult to understand, in nonetheless marked by simplicity.
from: "Kabbalah, The Untold Story of the Mystical Tradition" by Kenneth Hanson, PhD