Why would we care about the spiritual rays? These are the primary reasons:
Everything we do is done with the energy of one or several of the spiritual rays.
The entire material world is made from the seven rays.
Every limitation we face is created out of a perversion of one or more of the seven spiritual rays.
The ONLY way to transcend a given limitation is to free ourselves from
a) the belief that created the limitation, and
b) the low-frequency energy that has been generated.