Faith, assurance, and the unseen reality of God
When you have been touched by God, it is different. What you believe has become personal. You may struggle to explain the certainty you have, but the difficulty of communicating it does not make it insignificant.
How do you explain that to someone else? How do you speak of a confidence that reaches beyond your ability to answer every objection, without suggesting that faith and reason are enemies?
These questions bring us to a remarkable statement:
“Now faith is the substance of things hoped for, the evidence of things not seen.” — Hebrews 11:1, KJV
There is something profound here. Things still hoped for have a present substance. Things still unseen carry conviction. Faith enables a person to live now in the assurance of what has yet to become visible.
The word translated “substance” is the Greek hypostasis. Translations variously express it as substance, assurance, or confidence. We should allow the context to guide us rather than assume every possible meaning applies at once. What follows is especially helpful: Hebrews gives us lives in which this faith becomes visible. Hebrews 11:1, translation comparison
Noah acts on a warning about something he has not seen. Abraham goes where God calls him without knowing his destination. Moses makes costly choices because he looks towards a reward beyond Egypt’s riches. God’s unseen promise has become decisive for their present conduct.
Faith gives what God has said sufficient weight to act upon it before the outcome can be seen. Hebrews 11:7–10, 24–27
This helps us understand the relationship between faith and certainty. We often imagine that certainty must wait until everything has been explained or demonstrated to our satisfaction. Yet personal trust involves knowing someone well enough to entrust ourselves to them while much remains unknown.
Paul expresses this beautifully:
“I know whom I have believed, and am persuaded that he is able to keep that which I have committed unto him against that day.” — 2 Timothy 1:12, KJV
The word whom matters. Paul’s persuasion concerns the One into whose keeping he has committed himself. He speaks these words in the context of suffering. His circumstances have become painful, but his confidence in God remains.
For the believer, this has a deeply personal meaning. We hear God’s Word, come to Christ, and experience His grace and faithfulness. There can grow within us a recognition that is difficult to convey to someone who knows Christianity principally as a subject of debate.
God is no longer merely a proposition under consideration. We have come to trust Him.
That does not mean every Christian must have a dramatic experience. Nor does it make the intensity of an emotion the measure of faith. Some can identify a moment when God’s reality became overwhelming; others describe a quieter work of grace over time. Our confidence rests in Him, even when our feelings change.
It also does not mean we have become incapable of misunderstanding Him. We may need to reconsider an interpretation, correct an assumption, or acknowledge that we have spoken too confidently about something we do not fully understand. Assurance about God can coexist with humility about our understanding.
This matters when we encounter scholarship that challenges Scripture or claims to explain away what Christians believe about Jesus.
We should examine serious arguments honestly. Academic credentials do not make a conclusion automatically correct, and an unwelcome conclusion does not make its author automatically dishonest. We need to consider the evidence, the assumptions brought to it, and whether the conclusion actually follows.
But an objection we cannot immediately answer does not erase everything else we have grounds to trust.
There is a difference between acknowledging, “I do not yet know how to answer this,” and concluding, “Therefore, the One I have trusted is untrustworthy.” The second does not automatically follow from the first.
Faith allows us to bring an unresolved question before God without suspending our relationship with Him until we have mastered the subject. We can study, ask, listen, and think while continuing to pray and trust.
To protect our faith, then, is to give proper attention to the whole foundation of our confidence. As we read what others say about God, we should continue attending to His Word and walking with Him. A relationship needs nourishment, including when we are examining difficult questions about it.
Yet Hebrews 11 also keeps us from turning faith into confidence in whatever we happen to desire. Its witnesses respond to God. Their hope has an object beyond their own wishes.
Faith does not make a thing true because we believe it strongly. The believer’s assurance rests on the faithfulness of the One who has promised. We must therefore take care to distinguish His promises from our expectations.
The chapter makes this especially clear through the people who suffer. Alongside accounts of deliverance, we find people who endure persecution, deprivation, and death. They too are commended for faith. Some die still awaiting fulfilment.
Their suffering does not mean their faith has failed. Their continuing trust is itself part of the witness the chapter sets before us. Hebrews 11:13, 35–40
Here is a certainty strong enough to sustain a life without making that life easy. God’s promise remains worthy of trust when circumstances offer no immediate reassurance.
This is also the pilgrim’s position. We are travelling towards what we do not yet see. We have not arrived, and we cannot describe every turn in the road. Yet we can entrust ourselves to the One who has called us.
Hebrews brings its account of the witnesses into an exhortation to persevere, directing our attention to Jesus. Their testimony encourages us to run; He is the One to whom we look. Hebrews 12:1–3
Perhaps this is why the certainty of faith can be so difficult to explain. We are trying to speak about the reality of someone we have come to know, and about the confidence His faithfulness has awakened in us.
We may still have questions. We may still need help. We may pass through seasons when assurance feels faint. Yet faith enables us to commit ourselves to God while understanding is still incomplete.
“I know whom I have believed.”
And because we trust Him, His promise can sustain us today, even while we wait for what we cannot yet see.