For if we go on sinning deliberately after receiving the knowledge of the truth, there no longer remains a sacrifice for sins,
Do we know the truth?
Psalm 119:89
Forever, O Lord, your word is firmly fixed in the heavens.
Psalm 119:160
The sum of your word is truth, and every one of your righteous rules endures forever.
In my past others have used Hebrews 10:26 as justification for losing our salvation. What Psalm 119:160 says is that the sum of His Word is truth. We cannot stand on one line of scripture and pronounce judgment on ourselves or others.
Isaiah 44:25
who frustrates the signs of liars and makes fools of diviners, who turns wise men back and makes their knowledge foolish,
1 John 1:10
If we say we have not sinned, we make him a liar, and his word is not in us.
God is in control. He is not limited by our understanding and yet somehow we take on this great responsibility of believing that anything less than perfect understanding is failing God.
It is a lie. We are not in control of our destiny nor can we alter the truth.
The only thing within our control is trust. Trust is based on two things.
First it is based on our understanding which we now know is not perfect.
Secondly it is based on experience with the foundation of trust, faith in God, His promises, and our obedience of faith produce results that may lead us to trust God from that firm foundation or discover that we cannot trust our understanding because we make mistakes.
Key in that passage in Hebrews 10:26 is the word intentional. Choose to sin intentionally and that produces in us the fruit of unfaithfulness. God does not become a liar, we do.
For the word of God is living and active, sharper than any two-edged sword, piercing to the division of soul and of spirit, of joints and of marrow, and discerning the thoughts and intentions of the heart.