What does the Bible say about the purpose of Jesus' miracles?

In Mark 6, Jesus performs the miracle of feeding 5,000 people with five loaves and two fish to demonstrate His divine nature. Unlike humans, who might seek self-glory, His miracles serve the greater purpose of affirming His identity as the Son of God. Similarly, in John 6, after the miracle, many professed Him to be the promised prophet. However, Jesus discerned their hearts—they sought physical sustenance, not spiritual salvation. This reflects that miracles are intended to point to His authority and the necessity of genuine faith beyond mere physical needs.