Psalms

Despite being thought of as being the Psalms of David, not all the songs in this book were written by King David.  Many people were inspired to reduce their feelings to words, both to praise God, and to cry out in pain. 

Which means that whatever your circumstance of life, you will find something for you.  Whether you are in joy, or sorrow.  Whether you are in doubt, or feeling very faithful.

Ultimately though, all the Psalms come back to one central theme, which can be summed up in the haiku.

PSALMS
Praise ye the Lord.
In our joy, and our sadness,
our help comes from Him

Meditate on his words everyday, and sing Praises to the Lord.