Thus prophets not only call on us to repent of sin in general, but they also warn us when our sins are about to bring about our destruction. Prophets also warn us of other dangers. The Word of Wisdom warns against tobacco. Jeremiah warned against military alliance with Egypt. Joseph gave warning of seven years of famine in Egypt.
Prophets are indeed watchmen to warn the people as the scripture states.
Last of the five things prophets teach us, prophets tell us of changes in the way things are or the way things are to be done. This message is the thing most people notice about prophets and the thing most people look to be told. I have left it last in my talk because it is the least important of the five messages prophets bring. Christ is the core of the gospel. Following the message of Christ is the message of his love, without which we are as hollow brass or vain noise, without hope.