to delve deeply and meticulously into one's studies or research with great effort and persistence

他在学术上钻坚仰高，几十年如一日，终成一代大家。

describing the profound and inexhaustible nature of a great master's teachings or character, such that the more one studies it, the deeper it seems

圣人之道，钻坚仰高，不可穷尽。