Dhammapada 40 [Khuddaka Nikaya]

3 - Cittavagga, The Mind
6 - Pancasatabhikkhu Vatthu

Kumbhupamam kayamimam viditva, nagarupam cittamidam thapetva;
yodhetha maram panna vudhena, jitanca rakkhe anivesano siya.

40: Knowing that this body is (fragile) like an earthern jar, making one's mind secure like a fortified town, one should fight Mara with the weapon of Knowledge. (After defeating Mara) one should still continue to guard one's mind, and feel no attachment to that which has been gained (i.e., jhana ecstasy and serenity gained through meditation).
Reference:
Mya Tin, Daw, tr. The Dhammapada: Verses and Stories. Rangoon: Burma Tipitaka Association, 1986.

Posted by Nyan U