The sea of bitterness has no bounds, turn your head to see the shore (idiom). Only Buddhist enlightenment can allow one to shed off the abyss of worldly suffering.; Repent and ye shall be saved!
trad. 苦海無邊,回頭是岸
Also written 苦海無邊,回頭是岸【kǔ hǎi wú biān , huí tóu shì àn】