And Jesus said, For judgment came I into this world, that they that see not may see; and that they that see may become blind (John 9:39, ASV).
Those who can't see are either blind or non-observant. Certainly, Jesus has the non-observant in mind because those who see what goes on around them and make no "course adjustment", as this was the case in the days of Jesus, then those who refuse to do this are blinded by the god of this world (2 Cor. 4.4), that is, they have more of an interest in seeing, hearing, and doing those things that belongs to this world in which they live.
Those who love the Lord, on the other hand, live in this world, but they choose not to live according to the world.
One such way in which the god of this world blinds is in one's approach to God's word. This about it for a moment. Jesus said, He that rejecteth me, and receiveth not my sayings, hath one that judgeth him: the word that I spake, the same shall judge him in the last day (John 12:48). Who would be so bold to reject? We know who they are. They are those who are professors and promoters of evolution, they are those who have as their god the politics of this world, more loyal to a party than to the Lord. They are those who have as their god their children, their families, their occupations. Rather than be loyal to the Lord over any of these, they justify how they can't do the Lord's bidding because the children need other children, the family is leaving and I must leave, my work keeps me away, and on and on it continues.
Does any of this apply to you? Perhaps not (let us hope it does not), but if it does, then be mindful of this one thing: are you blind and not seeing (hearing) the Lord?