If you are persistent and consistent, you are bound to succeed. consistent : 持續的，始終如一的 persistent :持續的，堅持不懈的 請問:二者有有何差別?

１．差多，差多！

２．consistent多是用在　兩個事物　之間的對比　的一致性與協調性
例子們：

He is a consistent politician because he always does what he says and says what he does.
這裡用consistent 是因為在說明＜行為＞與＜口號＞的一致性．

The American model is more consistent on the path we observed on Harvey.
= 哈維（颱風）的路線　美國模式　的預測　比較一致．
這裡用consistent 是因為在說明＜路徑＞與＜預測＞的一致性．


３．persistent多是用在　一個事物　在時間上的　堅持／一致／持續性
例子們：

Her long illness comes to be the break point of his persistence.
= 久病無孝子
這裡用persistence是因為在說明 在時間上的　持續性．

The long drought persists regardless what the governments do.
這裡用persist是因為在說明 在時間上的　持續性．

4. 所以,你的原句 應該翻成:

要是你能 貫徹始終(persistent)也能內外一致(consistent),那你一定會成功的啦!

1. Someone who is "persistent" continues trying to do something, even though it is difficult or other people are against it.
persistent是不顧事情的困難和他人的反對，繼續去做某件事（重點是不畏難）。
2. Someone who is "consistent" always behalves in the same way, has the same attitude towards people and things, or achieves the same level of success in something.
consistent是對人和事的態度和行為始終如一（重點是不改變）。

兩者相同點是持續，不同點是前者不畏難（行動不終止），後者不改變（狀態不改變）。