The answers are in the Lord's Prayer. LUKE 11:2Our Father, which art in Heaven, hallowed be Thy name. Thy kingdom come, Thy will be done, as in heaven, so in earth.
The Lord's not saying that the world be as heaven (that is, no sickness or disease), He is saying however that the Christian has the right to receive God's will for their body.
Give us this day our daily bread and forgive us our trespasses as we forgive those who have trespassed against us.
For if we forgive not those who have sinned against us, neither will God forgive our sins. Let not the Lord say to you when you stand before Him in the day of judgement "depart from me you wicked servant for I do not know you".