Mesilas Yesharim is a step-by-step guide to climb through the ladder of Kedusha described by Reb Pinchas ben Yair (Avoda Zara 20b) to reach the zenith in Kedusha and Avodas Hashem.
This sefer has become a timeless classic in the Jewish library. It is passed down that the Vilna Gaon declared after reading the Mesillas Yesharim, that if the Ramchal would still be alive, he would walk from Vilna to Amsterdam to learn from him.
While this sefer has indeed become a classic and is studied the world over, it may be hard to understand without a teacher to help. Therefore, Artscroll and their team of Talmidei Chachamim have put together this edition of the Mesillas Yesharim, with an elucidated english translation as well as extensive footnotes and sources.
This sefer is available for purchase at https://amzn.to/2NKvvy6