From the first chapter of Patanjali’s Yoga Sutras

• Raja Yoga is a practice in quieting your mind.

• Your mind constantly processes four types of thought: correct, incorrect, imagined, and remembered.

• Quieting your mind requires correct thinking.

• By practicing clear correct thinking with single-pointed concentration, you gradually pass through four progressively clearer states of mental awareness before experiencing unfiltered consciousness.

• To succeed: never give up; always let go.