Definition & Meaning of "in the lap of luxury"

What is the origin of the idiom "in the lap of luxury" and when to use it?

The phrase "in the lap of luxury" originated in the 18th century and has its roots in the practice of wealthy individuals or royalty reclining or sitting in a comfortable position with lavish fabrics and cushions. This idiom is used to describe someone who is living in a state of extravagant comfort, enjoying all the finest and most luxurious things that life has to offer.