Everyone has children
You may not think you have children, or you may think you are in a place where you don't matter or have anything to influence in this world. You may think that you're just going about in the wilderness for no purpose or reason at all, that you're just taking up space here in this world and no one is noticing at all.
But I'm here to tell you, Wrong! You not only matter by yourself, but you have not only something, but you have GREAT THINGS. Let's call them: children. The children we have are our dreams. So why do we experience depression at times? My take on this is that we often experience this when we have forgotten or have been neglecting the GREAT hopes and dreams that God has placed inside of us. Just as a stomach ache tells us what's wrong, depression reminds us that we have neglected our hopes and our dreams.