“As He passed by, He saw a man blind from birth. And His disciples asked Him, ‘Rabbi, who sinned, this man or his parents, that he would be born blind?’ Jesus answered, ‘It was neither that this man sinned, nor his parents; but it was so that the works of God might be displayed in him. We must work the works of Him who sent Me as long as it is day; night is coming when no one can work. While I am in the world, I am the Light of the world.’ When He had said this, He spat on the ground, and made clay of the spittle, and applied the clay to his eyes, and said to him, ‘Go, wash in the pool of Siloam’ (which is translated, Sent). So he went away and washed, and came back seeing.” John 9:1-7
Imagine no red rose, no blue sky, no rolling green hills, and everything being a dull shade of grey. Without light, there is no color. Color is just bands of light reflected of an object; which bands are reflected depends on the nature of the object. Without light, things would be very plain - not to mention very dark!
So too without Christ - imagine no hope, no love, no future, and no present purpose for living. Jesus said, “I am the light of the world; he who follows Me shall not walk in the darkness, but shall have the light of life.” Without the light of Christ, there would be no spiritual blessings, no sustaining grace, and no daily bread worth eating. Just as it is impossible to receive mail without a delivery address, it is impossible to receive a true blessing outside the person and authority of Christ.