Sartre side that the fundamental life of people was only the constant anxiety of choice between Yes and No.
Even in real freedom of choice humans always have to deal with their needs, inconsistencies, dissonances, and congruences.
To have solid values about life reduces the anxiety of choice.
The more we know ourselves the less we suffer from the perpetual choice in life to find an equilibrium that is never reached.
But the law of lifeis to fight for that equilibrium.