Feeding of the 4000 - Because the people have been with Jesus for 3 days, Jesus didn't want to send the people away hungry because the people may collapse on their way so He fed them.
Healing of the leper - Lepers is outcast in Jesus day. If you are a leper, no one will touch you or even come near you. When the leper go to Jesus and ask Him if He is willing to make him clean, Jesus says He is willing. Jesus did not turn his back like the people did to the leper. Instead Jesus healed him.
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