Dhammapada 36 [Khuddaka Nikaya]

3 - Cittavagga, The Mind
3 - Ukkanthitabhikkhu Vatthu

Sududdasam sunipunam, yatthakamanipatinam;
cittam rakketha medhavi, cittam guttam sukhavaham.

36: The mind is very difficult to see, very delicate and subtle; it moves and lands wherever it pleases. The wise one should guard his mind, for a guarded mind brings happiness.
 
Reference:
Mya Tin, Daw, tr. The Dhammapada: Verses and Stories. Rangoon: Burma Tipitaka Association, 1986.

Posted by Nyan U