Attānaṃ ce tathā kayirā;
sudanto vata dametha.
Attā hi kira duddamo.
One should do what one teaches others to do;
if one would train others,
one should be well controlled oneself.
Difficult, indeed, is self-control.
The Dhammapada: The Buddha’s Path of Wisdom, translated from Pāli by Acharya Buddharakkhita