Svadhyaya : means self- study. A teacher can only guide a yoga student. A student must then go and study- expanding the knowledge they have learnt from their teacher, until they have some deeper personal understanding of the subject, being shown to them. Swadhayadisthaddevatasamprayogah YS 2.44 While practicing self study we totally submerse ourselves in the deity that we have chosen. See Sharath Jois- Astanga yoga Anusthana for his interpretation on this.