Isaiah was delivering a warning to the leaders of Israel (specifically Ephraim and Jerusalem). The people had mocked Isaiah's simple, repetitive prophetic messages, comparing them to baby talk ("precept upon precept, line upon line")..Start to Lean from Paul #12
this is actually Goid to seek out deeper Paul uses this same speech actual
OT
"For with stammering lips and another tongue will he speak to this people. To whom he said, This is the rest wherewith ye may cause the weary to rest; and this is the refreshing: yet they would not hear."