Namaste, Swami Sivananda Saraswati of Divine Life Society used to advice his disciples to to mediate on ब्रह्मज्ञानावळी. The link is below and the e-book can be downloaded. http://svbf.org/journal/vol4no1/brahma.pdf These hymns can be chanted that elevates the mind to the state of extreme peace and silence. rgs, sriram