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Upon this foundation of the Upanishads, principal systems of philosophy developed with systematic treatises being written in short pregnant half sentences called Sutras, which did not elaborate the subject, but were intended for those who had direct elaborate oral instructions on the subject.<ref name=":12" />

Upon this foundation of the Upanishads, principal systems of philosophy developed with systematic treatises being written in short pregnant half sentences called Sutras, which did not elaborate the subject, but were intended for those who had direct elaborate oral instructions on the subject.<ref name=":12" />

== Systematization of Darshanas ==

== Systematization of Darshanas ==

It can be seen that the spirit of philosophical enquiry, although had begun in the days of the earliest Upanishads, had continued even in circles other than those of the Upanishads. The Buddha and Jaina activities were also probably happening concurrently as no reference to them is seen in the Upanishads. Thus, it can be said that there were different forms of philosophical inquiry in spheres other than those of the Upanishads, of which we have but scanty records. In the assemblies of the sages and their pupils, the views of the heretical or heterodox thinkers were probably discussed and refuted. So it may have continued until some illustrious member of the assembly such as Gautama or Kanada collected the purport of these discussions on various topics and problems, filled up many of the missing links, classified and arranged these on the form of a system of philosophy and recorded it in '''Sutras (सूत्रम्)'''.<ref name=":12" /> Almost all shastras granthas are written in a certain writing format and the [[Shastra Lekhana Paddhati (शास्त्रलेखनपद्धति)|lekhana paddati]] (way of writing) includes one or a few of the following   

It can be seen that the spirit of philosophical enquiry, although had begun in the days of the earliest Upanishads, had continued even in circles other than those of the Upanishads. The Buddha and Jaina activities were also probably happening concurrently as no reference to them is seen in the Upanishads. Thus, it can be said that there were different forms of philosophical inquiry in spheres other than those of the Upanishads, of which we have but scanty records. In the assemblies of the sages and their pupils, the views of the heretical or heterodox thinkers were probably discussed and refuted. So it may have continued until some illustrious member of the assembly such as Gautama or Kanada collected the purport of these discussions on various topics and problems, filled up many of the missing links, classified and arranged these on the form of a system of philosophy and recorded it in '''Sutras (सूत्रम्)'''.<ref name=":12" /> Almost all shastras granthas are written in a certain writing format and the [[Shastra Lekhana Paddhati (शास्त्रलेखनपद्धतिः)|lekhana paddati]] (way of writing) includes one or a few of the following   

# Sutras (सुत्रम्)   

# Sutras (सुत्रम्)   

# Bhashya (भाष्यम्)   

# Bhashya (भाष्यम्)