THINK is the first key. The rest are studied in threes, fours, and fives.
The Primary Key
THINK
A Primary Triad
Think • Decide • Act
The Triad of Creative Thinking
Insight • Intuition • Imagination
These are the three aspects of higher thinking, also known as the three super faculties.
The Triad of Magick Power
Iccha – Will
Jnana – Knowledge
Kriya – Action
The Triad to Overcome: The KKK Matrix
Konditioning
Karmas
Kleshas
The Four Keywords
Sama
Samarasa
Sahaja
Svecchachara
The Pentagram of Kleshas
The five pain bearing obstructions,
The root causes of trouble and strife:
Ignorance — Ego — Repulsion — Attachment — Clinging to Life
Further Reading
The following essays by Shri Gurudev Mahendranath