"So let us be clear about this. It is no sign of humility, no mark of saintliness, to go into the presence of God doubting whether God is forgiving you. That is unbelief, lack of faith. That is a failure to understand the truth. So, my friend, never again try to give the impression that you are such a sensitive Christian that you do not like to be certain that your sins are forgiven. It is our business to know that our sins are forgiven! We derogate from the grace and the glory of God and the wonder of this gospel if we are uncertain about it: 'Having therefore, brethren, boldness to enter the holiest of all.' Not in my merit, not in my righteousness, not in terms of my understanding, but by the blood of Jesus. He has opened the way. And, therefore, we go knowing that God has said in this new covenant, 'I will be to them a God, and they shall be to me a people' (Heb. 8:10). It is the most glorious thing ever said to men and women; we are God's people."
-Martyn Lloyd-Jones, Great Doctrines of the Bible Volume 1, p 355.
Therefore let us draw near with confidence to the throne of grace, so that we may receive mercy and find grace to help in time of need. Hebrews 4:16