Search or quest — the active pursuit of knowledge, truth, or a goal (often intellectual or spiritual).
真理の探求は科学の基本だ。
The pursuit of truth is the foundation of science.
学問を探求する姿勢が重要だ。
A spirit of inquiry is important in scholarship.
彼は自己探求の旅に出た。
He set out on a journey of self-exploration.