Both "blaming it on you", and "all men doubt you", have brought you to this webpage because they mean the same thing. At the surface these lines mean no more than standing your ground when you know you are right. Each line is to give circumstances that arise in everyone's life in which they feel the pressure from others and might change their decisions. Kipling is showing his readers that standing your ground and having faith in yourself is one of the qualities required to be a man. Looking deeper at the lines though, it is possible that Kipling is showing some of his Imperialistic advice here. Kipling is telling his British readers that even though other races/countries are doubting them or blaming them, they must stay the course and know they are right. Britain was occupying India when this poem was published and Kipling was a firm believer that it was Britain's duty to help educate and rule over the Idians. These lines show Kipling's belief that staying the course of Imperialism was what he thought was the right decision.