in order to ~
A formal, literary pattern meaning 'in order to ~', used to express a strong purpose or determination.
This is a classical Japanese construction that survives in formal writing and speeches. It means 'in order to ~' but carries a sense of strong will or sacrifice, often translating as 'for the sake of ~ing' or 'with the aim of ~ing.' You'll see it in political speeches, essays, or news articles, not in daily conversation. The verb is in its classical negative stem (未然形) without ず, and the pattern attaches directly. For する, it becomes せんがために (not しんがために). For other verbs, use the 未然形, e.g., 赴かんがために (from 赴く), 得んがために (from 得る). This pattern is often used with verbs like 勝つ, 成し遂げる, 得る, or 守る.