17.填空 天下无难事，___ ___ ___ ___ ___ 。 - Cchatty

天 下 无 难 事
tiān xià wú nán shì
只 怕 有 心 人
Zhǐ pà yǒu xīn rén

means :
"under heaven nothing is difficult, but there are someone who has no determine to finish or keep doing it, so that thing failed"
use to encourage people don't give up or don't be afraid of difficulty.

What does the saying suppose to mean"under heaven nothing difficult just worry about people" am I right?

只怕有心人。

tiān xià wú nán shì，zhǐ pà yǒu xīn rén
天 下 无 难 事，只 怕 有 心 人。