Like people walking at night, Christians must make their way through a world that appears dark, but that actually has some of God’s light present at all times and in all places. We can’t always see that light on our own and if we try to deal with things purely in our own strength, we sometimes stumble, disoriented and discouraged. But like night vision goggles, the Holy Spirit gives us the ability to perceive God’s light in a situation, allowing us to better deal with it.
There is another other parallel. Night vision goggles only help if they are put on, requiring the wearer to make the effort to avail himself of their benefits. Likewise, we only benefit from the Spirit’s guidance if we seek His help. He doesn’t impose His self on us; we have to be open to/seek out His help. Like someone who won't use the goggles offered him, we stay in the dark if we try to make it through on our own.