Caraka Samhita, Sutra Sthana 1.58

Disorders of the mind are met with knowledge, skilled knowing, courage, memory, and collectedness.

मानसो ज्ञानविज्ञानधैर्यस्मृतिसमाधिभिः ।

manaso jnana-vijnana-dhairya-smrti-samadhibhih |

Disorders of the mind are met with knowledge, skilled knowing, courage, memory, and collectedness.

The commentator Chakrapani names five inner tools: self-knowledge (jnana), learning and science (vijnana), steady courage (dhairya), memory of what we have lived through (smriti) and focused calm (samadhi).