It is our duty to remember that a nation has no more right to do injustice to another nation, strong or weak, than an individual has to do injustice to another individual
 Theodore Roosevelt, State of the Union Address. copy citation

Context

“although of course far more often to guard against our own selfish or thoughtless shortcomings. If these self-evident truths are kept before us, and only if they are so kept before us, we shall have a clear idea of what our foreign policy in its larger aspects should be. It is our duty to remember that a nation has no more right to do injustice to another nation, strong or weak, than an individual has to do injustice to another individual; that the same moral law applies in one case as in the other. But we must also remember that it is as much the duty of the Nation to guard its own rights and its own interests as it is the duty of the individual so to do.” source