In The Morning Its Always Leah Never Rachel

We learn that through all of life there runs a ground note of cosmic disappointment. You are never going to lead a wise life until you understand that. Jacob said, "If I can just get Rachel, everything will be okay." And he goes to bed with the one who he thinks is Rachel, and literally, the Hebrew says, "in the morning, behold it was Leah" (Genesis 29:25). One commentator noted about this verse, "This is a miniature of our own disillusionment, experienced from Eden onwards." What does that mean? With all due respect to this woman (from whom we have much to learn), it means that no matter what we put our hopes in, in the morning, it is always Leah, never Rachel.
Counterfeit Gods, by Tim Keller, pg 37. Counterfeit Gods: The Empty Promises of Money, Sex, and Power, and the Only Hope that Matters

If you haven't read this book I encourage you to do so. All of us have experienced waking up with Leah when we thought we went to bed with Rachel. There is nothing, no person, no job, no amount of wealth, fame, or success you can put your hope in that will be Rachel, you will always wake up with Leah. You will always be disappointed unless you do what C.S. Lewis said, reorient the entire focus of your life toward God.