Sadness (a.k.a. the spirit of heaviness) tries to take up real estate in your emotions by looking for justification to be there. Don't give it a reason to attach itself to you. Don't look at your sad past or sing your sad song. If you focus on all your reasons to be sad, you will give this demonic spirit access by agreement. Instead, change your gaze and praise! Joy belongs to you. Joy is your portion. Joy is not based on your circumstances and is always accessible.