〜てはじめて
only after, not until
Verb て-form + はじめて
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てはじめて means you only realised, understood or could do something after a particular experience: 病気になってはじめて、健康の大切さがわかった, "only when I got ill did I realise how important health is".
The second part is usually a realisation: わかる, 知る, 気づく, 気がつく. The first part is the experience that made it possible, often an unpleasant or eye-opening one.
It's stronger than てから ("after"): it says "not before then". English often uses "it wasn't until …" or "only once …".
はじめて can also be written 初めて. It's the same word as "for the first time".
Examples
病気になってはじめて、健康の大切さがわかった。
Only when I got ill did I realise how important health is.
一人で暮らしてはじめて、親のありがたさを知った。
It wasn't until I lived alone that I appreciated my parents.
言われてはじめて、間違いに気がついた。
I only noticed the mistake when someone pointed it out.
実際に行ってはじめて、その町のよさがわかる。
You only see what's good about that town once you actually go.
失ってはじめて、大切なものに気づく。
You only realise what's precious once you've lost it.