The first section analyses whether the concept of "A doubt in a biblical issue is dealt with stringently" is actually a biblical concept itself or whether it is entirely of Rabbinic origin. This section continues into a discussion of the principles that, if there is a doubt concerning a case of spiritual impurity, if this occurred in the public domain we rule leniently and in the private domain stringently (Sotah 28b). Finally, the ruling that in a case of "Sefek Sefeika" - a case of doubt in which one side of the question is itself subject to doubt - we rule leniently is explained. The reason is that since most sides of this question lean to the lenient side, the principle of "Rov" - that we follow the majority - is called in and we rule leniently.