Self-observation and self-remembering constitute the crux of the psychological work.
Subject, object, location, the Key of Sol, is a technique we use to strengthen our consciousness in self-observation and intimate remembrance of the Being, specifically in preparation for dream yoga.
Keeping our psychological bowl empty refers to receiving the impressions of life with cognizance, to understand our neighbor's words without our internal chatter or poor secretary (subjective personality) translating everything in a mistaken manner.
These are all different techniques for consciousness, founded on observation and awareness (muhadarah) of the presence (hudur) of the Being (may He be praised and exalted)!
Meditation armors our consciousness and helps us to maintain vigilance throughout an entire day, during multiple activities in life. The more we work with the consciousness, the stronger it becomes.
With practice, your soul will grow and learn to conquer great things in life, but to get to such points we must firmly establish esoteric discipline within our interior.
All of these esoteric disciplines of the mind must saturate our daily life. –Samael Aun Weor, Igneous Rose: Esoteric Discipline of Mind