When you have someone to please, it keeps you on your toes and you are happier. But if your goal is just to please yourself, depression is sure to follow.
Boredom is a blessing when it leads you to wisdom. And boredom is a curse when it leads you to frustration and depression.
In life, if you do not adore or appreciate anything, you will be filled with negativity; a person who has nothing to worship or adore is sure to fall into depression.
Depression is a sign of static understanding about life. When you feel everything in life is dead, static, there is nothing more, nowhere to go, that is when one gets depressed.