Now I know that G-d is the greatest of all deities (Exod. 18:11)
To say that G-d is greater than all the other gods is heresy because it implies that other gods have some substance. Why would Yitro say such a thing?
This statement is not one of relative comparison, but of total rejection. Yitro was the High Priest of Midian and a very prominent theologian. He was familiar with all of the gods the pagan world worshipped. After learning of the miracles that G-d performed he was convinced of the worthlessness of all the other deities and of G-d’s identity as the one and only G-d of the world. Hence he proudly proclaimed, “Now I know that G-d is great, and I have reached this conclusion through realizing the falsehood of all the other gods.”
(Alshich)
You shall not kill (Exod. 20:13)
When this mitzva of the Ten Commandments is read in private, it is read “lo tirtzach.” When the Torah is read in public, the Ashkenazic pronunciation of these words are “lo tirtzawch” (with the Hebrew vowel kametz instead of patach).
These two variant pronunciations teach us that there are two types of murder which are forbidden. The first is the actual shedding of blood. The second is shaming a person in public, which the Talmud equates to murder.
(HaRav Tzirilson M’Kishinev)

