The Compendium of Caraka 3.8.34

3.8.34

atha dṛṣṭāntaḥ---dṛṣṭānto nāma yatra mūrkhaviduṣāṃ buddhisāmyaṃ, yo varṇyaṃ *varṇayati/

Now, the example: an example is that in which the understanding of both the foolish and the learned is equal, and which illustrates what is to be illustrated.