Hitopadesha 2.26

2.26

aparaṃ ca-
maunān mūrkhaḥ pravacana-paṭur bātulo jalpako vā
kṣāntyā bhīrur yadi na sahate prāyaśo nābhijātaḥ |
dhṛṣṭaḥ pārśve vasati niyataṃ dūrataś cāpragalbhaḥ
sevā-dharmaḥ parama-gahano yoginām apy agamyaḥ //

And furthermore:
From silence [he is called] a fool; if skilled in discourse, mad or garrulous; / from forbearance, a coward; if he does not endure, mostly base-born; / staying by the side, he is brazen; remaining far off, unconfident: / the duty of service is exceedingly profound, incomprehensible even to yogins.