Light straddles the defining line that runs between the physical and the spiritual. Sans weight, sans mass, sans just about any of matter’s properties, light is the most ethereal of physical “things.”
Based on the Thirteen Principles of Faith formulated by the Rambam in his Commentary on the Mishnah (tractate Sanhedrin 10:1).
Attach yourself to the Creator with complete love. This must surpass your love of any worldly good, because everything is rooted in the Divine.