What does the Bible say about the confidence of believers?

The Bible, particularly in Hebrews 10:35, instructs believers not to cast away their confidence, emphasizing its great reward. Confidence in Christ stems from understanding the exceeding greatness of His sacrifice and work as our High Priest. This confidence is founded on the truth that Christ's sacrifice was perfect and sufficient to take away our sins once for all. As we reflect on the enormity of our salvation, we can approach God with boldness, resting in the assurance of His promises.