You can see spiritually

“I pray that the eyes of your heart may be enlightened, so that you will know what is the hope of His calling, what are the riches of the glory of His inheritance in the saints.” (Eph. 1:18)

Things you cannot see

I’ve spoken to people who say they don’t believe in God because they cannot see Him. Yet, there are many things they use that they cannot see such as radio signals, magnetic waves, microwaves, gravity, electricity and oxygen, just to name a few.

The spiritual world

There is also an invisible spiritual world that exists that you cannot see. The Bible tells us that the things we see are temporary and the things we cannot see are permanent (eternal).

“So we fix our eyes not on what is seen, but on what is unseen. For what is seen is temporary, but what is unseen is eternal.” (2 Cor. 4:18)

Elisha prayed for his servant to see the invisible

“Then Elisha prayed and said, "O LORD, I pray, open his eyes that he may see " And the LORD opened the servant's eyes and he saw; and behold, the mountain was full of horses and chariots of fire all around Elisha.” (2 Kings 6:17

You must be born again to understand spiritual things

“Jesus answered and said to him, "Truly, truly, I say to you, unless one is born again he cannot see the kingdom of God."(John 3:3)

“To open their eyes so that they may turn from darkness to light and from the dominion of Satan to God, that they may receive forgiveness of sins and an inheritance among those who have been sanctified by faith in Me.'” (Acts 26:18)

Spiritual blindness is removed

“But whenever a person turns to the Lord, the veil is taken away.” (2 Cor. 3:16)

Those who are spiritual receive understanding

“But people who aren't spiritual can't receive these truths from God's Spirit. It all sounds foolish to them and they can't understand it, for only those who are spiritual can understand what the Spirit means.” (1 Cor. 2:14 NLT)

Faith gives assurance about what you cannot see

“Faith is the confidence that what we hope for will actually happen; it gives us assurance about things we cannot see.” (Heb. 11:1 NLT)

Therefore…

“For though we live in the world, we do not wage war as the world does. The weapons we fight with are not the weapons of the world. On the contrary, they have divine power to demolish strongholds. We demolish arguments and every pretension that sets itself up against the knowledge of God, and we take captive every thought to make it obedient to Christ."( 2 Cor. 10:3-5)