From "The Writings of Rabbi Yisrael", the end of letter #22, pg. 56:
The main point of the revelation of Hashem's G-dliness and Kingship, may He be blessed, to all who walk the earth, is through the aspect of memory, that it is necessary to guard one's memory very much. And the main point of memory is to strengthen oneself very much to bind well in one's mind and in one's knowledge the shining holy and awesome light that the Tzaddik shines to each person at every moment. And as long as the wisdom of the Tzaddik is not drawn into the heart well until we will never forget it then we still do not know about Him at all, may He be blessed.
The one who looks forward to your salvation every day and every moment.
Yisrael Dov Odesser