What is the theme in The Prophet by Khalil Gibran?

God in The Prophet is a personal, willing and compassionate being. In the heart of God, love most perfectly resides. Marriage is eternal in God's mind, and he intends it not to be controlling. God smiles when people give unreservedly and with interest in reward. People should silently meditate on God both as resting in reason and moving in passion. Unseen, God guides the physician's hand and weeps over whatever heavy treatments are required to heal disease.