John 1:4

"In the same was life; and the life was the light of humans."  Within the LOGOS, the word, reason, thought, logic (as Augustine understood LOGOS) was life.  Before the LOGOS becomes incarnate in Jesus (verse 14), life is to be found within.  It is quite an irony that some brief passages of scripture are often superficially cited as to why followers of Jesus should not think or otherwise engage in disciplined reasoning.  Our very life as humans lies precisely here, in LOGOS.  To reject reason is to cease living.  That much of the so-called church is characterized by pablum is the most severe indictment that can be brought against it.  In the last part of this verse,  the Logos-Life then becomes the light of humanity.  As Jesus noted, if our light is darkness, how great is our darkness.  Yes, as we shall see in the following verses, every person has the divine light.  But to reject this light is to reject the essence of being alive.