connective N2 common writtenpolite
〜てこそ — only by ~ing
〜てこそ ・ てこそ
Builds on て形
Meaning
- only by ~ing / it is precisely through ~ that — singles out one action as the indispensable means by which something good is achieved
Key sentence
努力してこそ、成功が得られる。
It is only by making an effort that success can be gained.
Formation
| Attaches to | Form | Example |
|---|---|---|
| Verb て-form + こそ | Vて + こそ + [the result it makes possible] | 助け合ってこそ家族だ |
When: Emphatic and somewhat formal/aphoristic — common in mottos, principles, and motivational statements.
Examples
苦労してこそ、本当の喜びが分かる。
Only through hardship can you understand real joy.
信頼があってこそ、チームは強くなる。
It is precisely because there is trust that a team grows strong.
When you can't use it
- Presents the て-action as the sole necessary condition for a positive outcome; the result clause is favourable. Often pairs with あって (〜があってこそ 'only because there is ~').
Easily confused with
〜からこそ からこそ emphasises a REASON ('precisely because ~'); てこそ emphasises a necessary MEANS or condition ('only by ~ing'). からこそ takes a reason clause, てこそ an action. こそ こそ is the bare emphatic particle 'precisely / the very' on a noun; てこそ applies that emphasis to an action as the one decisive route to a result.
See 〜てこそ in real sentences
Jengo shows 〜てこそ the way you actually meet it: inside real Japanese sentences, so it sticks instead of staying an abstract rule.
Study it in JengoSources Compiled from published Japanese grammar references.