His greatest achievement was presenting the thoughts of shah waliullah ra in an easy to understand,modern perspective.Shah sahib ra had his own ideas ,,based on quran and sunna,about the political and social uplift of Muslims,spread through out his books.Ubaidullah sindhi did the much needed work of compiling them together and then presenting them to muslim masses.Similarly Shah sahib had his own views ragarding fiqh,phiosophy,social justice (irtifaqat) and politics,mawlana sindhi took it upon himself to present them to the world.Even if we forget his relentless struggle against British imperialism,we will ever be indepted to him for his scholistic achievements.