กระต่ายหมายจันทร์
Transliteration: Kra-tie' mai jhun.
Translation: A rabbit aims for the moon.
English equivalent: Don't stretch your arms more than your sleeves can reach.
- Thai proverbs
Meaning: Don't aim at the impossibilities; get grounded.
Winitchaikun (1987). Rattanakōsin. Bamrung Sān.
http://en.wikiquote.org/wiki/Thai_proverbs