からこそEmphasized because, Precisely because

Despite appearing different, ～ばこそ and からこそ are essentially synonymous in meaning, both expressing an reason for something, i.e. 'it is precisely because of (A) that (B)'. The main difference is that ～ばこそ is a highly formal and literary expression found primarily in writing, while からこそ is far more common and used in everyday speech as well as writing.

から expresses a reason or cause, similar to 'because of A, B' or 'A, so B' in English. The reason comes before から, with the result after. からこそ is the same から followed by the emphatic こそ, highlighting that the given reason is precisely or solely responsible for what follows. It's used for strong arguments or emphatic points.

あまり follows a noun or verb phrase and shows that an extreme state leads to an unintended result, e.g. 緊張のあまり声が出なかった ('I was so nervous I couldn't speak.') からこそ attaches after the reason and emphasizes it as the precise cause, e.g. 緊張したからこそ全力を出せた ('It was precisely because I was nervous that I gave it my all.')

からこそ and ことだから are similar in that both can emphatically state a reason. However, ことだから is typically used to make a prediction or assumption based on a person's known behavior or character, e.g. 田中さんのことだからできると思う ('Because it's Tanaka, I think he can do it'). In contrast, からこそ is more broadly used to emphasize a specific reason, e.g. 努力したからこそできた ('I could do it precisely because I worked hard').

Both からこそ and ～てこそ emphasize cause and effect, but they differ in nuance. からこそ highlights a specific reason with a strong emphasis, e.g. 努力したからこそ合格できた ('I was able to pass precisely because I worked hard'). In contrast, ～てこそ indicates that only after a certain condition is fulfilled can something else happen, e.g. 努力してこそ意味がある ('It only has meaning after putting in effort').

からこそ and ものだから are similar in that both can be used in expressing a reason. They differ in that からこそ is used to specifically emphasize the reason, like saying 'it is precisely because of (A) that (B)', while ものだから is not as emphatic, and is generally used when providing an explanation or excuse for one's actions or a situation.

Both use こそ for emphasis, but からこそ highlights a reason or cause, meaning 'precisely because', e.g. 努力したからこそできた ('I could do it precisely because I worked hard.'). こそ on its own emphasizes the word it follows, framing it as precisely the one, e.g. 彼こそできる ('He, if no one else, can do it.')