Dhamma Verses (Dhammapada, KN 2)

10: The Chapter about the Stick – 140
The restrained are aware of their faults
The poor man Pilotika was ordained by Ven. Ānanda, grew fat
and discontented, and thought to return to the lay life; but
finding his previous rags he took them as a meditation subject
and soon became an Arahat; the Buddha confirmed his status
to the monks and spoke these verses.
143. Hirīnisedho puriso koci lokasmi’ vijjati,
yo nindaṁ appabodhati, asso bhadro kasām-iva.
Whatever person in the world
is restrained by conscience, and is
aware of his fault, is like a
good horse that is restrained by whip.
144. Asso yathā bhadro kasāniviṭṭho,
ātāpino saṁvegino bhavātha.
Saddhāya sīlena ca vīriyena ca,
samādhinā Dhammavinicchayena ca.
Sampannavijjācaraṇā patissatā,
pahassatha dukkham-idaṁ anappakaṁ.
Like a good horse restrained by whip,
you should be ardent and intense.
Having faith, virtue, energy,
concentration, investigation.
One who has understanding and
good conduct, also mindfulness,
will surely abandon this not
insignificant suffering.