..Tawheed is the most fundamental principle, and the greatest understanding (Fiqh al-akbar). It is the first thing that the writers should write about, and it is what the callers to guidance, and what the supporters of the truth should focus on. It is the most important science that they should grab onto with their molar teeth, and it should be spread among all societies, until they know its reality, and until they distance themselves from whatever opposes it.
— Imam Bin Baaz رحمه الله