Matthew 4

Jesus begins His public ministry in a unique way, by going into seclusion.  During this 40-day period (Why 40 days?  Because He entered and exited at the discretion of the Holy Spirit, and that was how long the Holy Spirit directed.  Nothing magical about that.) He underwent severe temptation.  The temptations centered around using His divine nature ("since You are the Son of God...") to make His human existence easier.  Refusing to yield, Jesus faced every temptation fully as a man, yet without sin.

Jesus then begins to preach.  His message is the same as the prophets before Him "Repent!  The Kingdom of God is at hand!"  Many begin to follow Him and listen to His teachings concerning the coming kingdom in which God is the Sovereign.