If you just think great ideas but don't take action based on them, you will experience frustration and depression. Remember that healthy depression is a sign that action is required to change something about your life!

This begs the question "What is unhealthy depression?". This is a complex subject but if negative thoughts persist in dominating your mind negative behaviors will also persist leading to negative outcomes in your life. The trick is surely to act according to a positive thoughts, despite having continued negative thoughts?