How do we know that Jesus experienced true human emotions?

The anguish Jesus felt as described in John 13:21 confirms his complete humanity and ability to experience human emotions deeply. He is portrayed as feeling sorrow and distress, particularly at the betrayal of Judas, whom he loved. This emotional depth is significant for understanding the Incarnation, where Jesus fully embraced human experience, ensuring no aspect of human struggle is foreign to him. Unlike our experiences of anguish, which may be marred by sin, Jesus' anguish was pure and righteous, reflecting his holy nature. His emotional responses can be a source of comfort to believers, showcasing a Savior who truly understands our struggles and sorrows.