If man will utilize vegetable matter the right way then his physical machinery and mental system will work right. But if he will not utilize this vegetable matter the right way then his physical machinery and mental system will work wrong. Man's whole physical being, therefore, works strictly according to action and reaction. Right action-right reaction. Now, spiritual action and reaction are graded in man, either for or against him, as he himself thinks.
Good thoughts bring good reaction and bad thoughts bring bad reaction.
As you give so you will receive. What you would like to happen to others will sooner or later happen to you. The Law of Maneuverability will work to protect you if you deserve it, or it will work to punish you if you deserve it. Whichever way you turn will be the right way, for your protection, if you have no evil thoughts concerning other creatures, or whichever way you turn will be the wrong way if you wish evil things would happen to others. God's reactions are for or against you spiritually as well as physically in strict accordance with your own actions.