מצדקת הצדיק לצדקת הצדיק המלא לצדקת 

Tzadok HaKohen of Lublin

Famed master of Chasidic thought and prolific author in all areas of Judaism: Halakhah, Chasidut, Kabbalah, and ethics. He also wrote scholarly essays on astronomy, geometry, and algebra. R' Tzadok, born into a rabbinic family affiliated with the Mitnagdim (opponents of the chasidic movement), was introduced to Chasidut when he met with R' Mordechai Leiner of Izhbitz and became his disciple. After the Izhbitzer's death, he became a follower of R' Yehuda Leib Eiger of Lublin, and eventually his successor as Rebbe of Lublin. He authored Pri Tzadik on the Torah, Tzidkat HaTzadik, Resisei Layla, and many other works on various topics.הצדיק השלם