靡不有初，鮮克有終 [－－－－－鲜－－终]

Jyutping mei5 bat1 jau5 co1 , sin2 hak1 jau5 zung1
Pinyin mǐ bù yǒu chū , xiǎn kè yǒu zhōng

Definitions (CC-CEDICT)
  1. almost everything has a start, but not many things have an end (idiom); don't start sth you can't handle