The light of God shines equally in all, but because of delusive ignorance all do not receive, reflect, it alike. Sunlight falls the same on a lump of coal and a diamond, but only the diamond receives and reflects the light in brilliant splendor.
The carbon in the coal has the potential to become a diamond. All it requires is conversion under high pressure. So it is said here that everyone can be like Christ–whosoever clarifies his consciousness by a moral and spiritual life, and especially by the purification of meditation in which rudimentary mortality is sublimed into the soul’s perfection of immortality. — Paramahansa Yogananda (1893-1952)
Eudaimonia 