For every action there is an equal and opposite reaction.
Many have extrapolated this physical notion to diplomatic, military, and political affairs.
To any action there is always an opposite and equal reaction; in other words, the actions of two bodies upon each other are always equal and always opposite in direction.
Rocket engines generally are simpler than jet engines, not more complicated.
Depend on it, that from every condition of distress or evil there is a great reaction, and the greater the evil or distress, the greater the reaction. If we do not get a reaction quick, we will get it long when it does come.
Government is like physics, you know - for every action, there's a reaction.
To every action there is always opposed an equal reaction.
Action and reaction are equal and opposite.
To every action there is always opposed an equal reaction, or, the mutual actions of two bodies upon each other are always equal, and directed to contrary parts.
See with what force yon river's crystal stream Resists the weight of many a massy beam. To sink the wood the more we vainly toil, The higher it rebounds, with swift recoil. Yet that the beam would of itself ascend No man will rashly venture to contend. Thus too the flame has weight, though highly rare, Nor mounts but when compelled by heavier air.
Of all the trees we could've hit, we had to get one that hits back.