What does the Bible say about troubled hearts?

In John 14, Jesus directly addresses the troubles of His disciples, reminding them not to allow their hearts to be troubled. He empathizes with their sorrow over His impending departure, acknowledging their feelings while assuring them of His presence and the peace that comes from faith in Him (John 14:1-3). Jesus encourages His followers to believe in God and to believe also in Him, presenting faith as the remedy for inner turmoil. This teaching underscores the understanding that Jesus, our high priest, can relate to our struggles and offers us hope and comfort in our distress.