When studying or discussing Biblical concepts we should refrain from using passages that have no real relevance to the passage to which we are referring. for example if we are looking atIsaiah 1:3, why introduce anything that doesn’t pertain to not knowing who God really is? there is in Exodus 3 and 4 the conversation between the Creator and Moses. Moses doesn’t want the job and tries to refuse, but God, refutes every argument including Moses not being able to speak well. Moses may have thought this was relevant at the time, but God didn’t. Exodus 4:10, “Please, Lord,” Moses replied, “I have never been eloquent, neither in the past nor since You have spoken to Your servant, for I am slow of speech and tongue.”