Read Viktor E. Frankl - Man´s search for meaning!!!
It will help you, no matter what situation you are in. If you are sad it will bring you up and if you are happy it will keep you grounded
It´s a very good book - not too heavy and you can easily take it to heart.
It will help you - that´s a promise. I would say it´s my bible
Here are some quotes from Viktor
"Live as if you were living a second time, and as though you had acted wrongly the first time."
"What is to give light must endure burning."
"For the meaning of life differs from man to man, from day to day and from hour to hour. What matters, therefore, is not the meaning of life in general but rather the specific meaning of a person's life at a given moment."
"Between stimulus and response there is a space. In that space is our power to choose our response. In our response lies our growth and our freedom."