This verse is from the Bhagavad Gita, Chapter 6, Verse 16. It is written in Sanskrit and translates to English as follows:
nātyaśhnatastu yogo ’sti na chaikāntam anaśhnataḥ
na chāti-svapna-śhīlasya jāgrato naiva chārjuna || 16 ||
"Yoga is not possible for one who eats too much or one who eats too little. It is not possible for one who sleeps too much or one who does not sleep enough, O Arjuna."
In essence, this verse emphasizes the importance of moderation and balance in all aspects of life, including eating, sleeping, and waking, for the successful practice of yoga.
na: not
aty-aśnataḥ: of one who eats too much
tu: but
yogaḥ: yoga
asti: is
na: not
ca: and
ekāntam: completely
anaśnataḥ: of one who does not eat (eats too little)
na: not
ca: and
ati: too much
svapna-śīlasya: of one who sleeps too much
jāgrataḥ: of one who keeps awake too much
na: not
eva: indeed
ca: and
arjuna: O Arjuna