Wisdom has built her house; she has hewn her seven pillars.
Proverbs 9:1

Wisdom completed her labor in building her house and has paid her dues, so to speak. The seven pillars represent the final perfection of her philosophy. They might even have names. Her house is her teaching and it is fully and perfectly supported by experience, knowledge, reason, etc. It might also be intended to refer to the Creation Week or to the seven spirits or God in Isaiah 11.