Jisho

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Particle
1. it is ... that ...; precisely; in particular; definitely; for sure; only (when, after, because, etc.)​emphasizes preceding word or phrase
  • こだわり
  • は
  • お
  • きゃく客
  • に
  • つた伝わって
  • こそ
  • いみ意味をなす
  • 。
Care over the particulars only has meaning once it gets across to customers.
Particle
2. although; while; it is the case that ... but​as こそあれ, こそすれ, こそするが, etc.
  • かれ彼
  • は
  • とし年
  • こそ
  • わか若い
  • が
  • じゅうぶん十分
  • その
  • しごと仕事
  • を
  • やっていける
  • 。
Young as he is, he is equal to the task.
Particle
3. it is precisely because ... that ...; only because ...​after conditional -ba form of verb
  • きみ君
  • の
  • ため
  • を
  • おも思えば
  • こそ
  • こういこう言ってるんだ
  • 。
It is precisely because I have your best interests at heart that I am saying this.
Particle
4. not at all; not in the slightest; absolutely not; never​Formal or literary term, after -nai stem of verb + ば

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