Ephesians 1:18-19 NIV
“I pray that the eyes of your heart may be enlightened in order that you may know the hope to which he has called you, the riches of his glorious inheritance in his holy people, and his incomparably great power for us who believe. …”
As Christian people we all, and always need our spiritual eyes open so that we can understand more and more who we are, in Christ. Our grasp of the massive hope we have in our Saviour Jesus deepens our love and devotion. It is a real and certain hope which we can view with enlightened eyes. We have an inheritance because we belong to Christ and which we share with all the people of God. Our inheritance is kept for us until we enter into its glories, when our Lord returns to bring all His people home to His glory. Even as we live in the here and now, we have the power of God to sustain us, keep us in His grace and enable us to walk worthy of Him who loves us.

Hebrews 6:4-6 NIV
“It is impossible for those who have once been enlightened, who have tasted the heavenly gift, who have shared in the Holy Spirit, who have tasted the goodness of the word of God and the powers of the coming age and who have fallen away, to be brought back to repentance. …”
Surely this reference to enlightenment is frightening. It speaks of people who have received some enlightenment to believe, and yet have turned away. People who hear the gospel and understand the message, and yet reject Christ and fall back again into their chosen sinful lifestyle. These people have known the sweetness of the Holy Spirit working in them, and yet they grieve Him away with unbelief. They actually know and realise the goodness of God and have an inkling of the glory of the kingdom that will come, but fall away from it all to enjoy this transient world kingdom.
Once they have fallen away, they are irrevocably lost. No matter what they hear, see or understand again, they are forever barred from salvation. They are lost already and nothing or no one can bring them back. It is a fearful state and one that should fill us with holy fear, that we are safe in our Lord Jesus.

Hebrews 10:32-33 NASB
“But remember the former days, when, after being enlightened, you endured a great conflict of sufferings, partly by being made a public spectacle through reproaches and tribulations, and partly by becoming sharers with those who were so treated.”
Christians are being encouraged to think of the days when they were searching for Christ. They are to remember the time when they were enlightened, illuminated, brought into the full light of gospel day. That wonderful moment and day of salvation, brought in days of trouble and hardship for them. The Christians had to go through days and long periods of suffering for the sake of their faith in Jesus Christ. They felt the pain of rejection by society and the stigmatisation of their way of life and were publicly reviled for their holy deeds and words. They were, as a group of people, subject to such negative prejudice, that when one suffered, all suffered. There was a bond of fellowship that kept them close to each other and their Saviour. When one was punished, all were punished by the pain of reproach. Such is the cost of enlightenment in the power of the Spirit.

Psalm 19:8 ESV
“The precepts of the LORD are right, rejoicing the heart; The commandment of the LORD is pure, enlightening the eyes.”
Everything that comes from the mind and voice of God is right. The Lord of all speaks only truth. To those who love Him, His Word causes rejoicing. No part is ordinary or commonplace. Every command He makes is pure and we can follow it with complete confidence. These great and precious edicts and teachings open our inner eyes to see God and give us clarity of understanding and wisdom.
If we do not love His Word, we do not love Him. Those who love His Word find themselves taken up with it, reading and obeying. This is what gives light to the understanding and wisdom to the soul.