Tā chéngnuò de xiàngmù dōu néng shànshǐshànzhōng, suǒyǐ dàjiā dōu xìnrèn tā.
He sees every project he commits to through to the end, which is why everyone trusts him.
Tips
history
From 《庄子·大宗师》 (Warring States): 「善妖善老,善始善终」 — 'good in youth and in age, good at the start and at the end.' Also cited in Sima Qian's 《史记·陈丞相世家赞》 praising Chen Ping's whole career as 善始善终.
usage
Natural pairing with 半途而废 (bàntú'érfèi, 'to give up halfway') as its opposite.