(I’ve written this as a piece about the role of meditation in Jewish life. But it’s no less applicable to Christian, Muslim or other “life” traditions.)

1 Maimonides: Mishnah Torah/Book of Knowledge 1:1; see also Yesodei ha-Torah 1:1
2 Soloveitchik, Rabbi Joseph B., Pinchas Peli, trans. and ed.; Soloveitchik on Repentance; p. 130
3 ibid., p. 131
4 ibid., p. 132
5 ibid., p. 132
6 ibid., p. 134 
7 Soloveitchik, Rabbi Joseph B.; The Lonely Man of Faith; p. 32, (note)
see also:
https://rabbielimallon.wordpress.com/2016/02/10/2-10-16-believing-in-god/
8 Levy, Rabbi Clifton Harby; The Jewish Life; The Jewish Science Advance Publishing Company; © 1925, p. 36
9 Holmes, Ernest; Ideas of Power; p. 111
10 see:
https://rabbielimallon.wordpress.com/2022/03/01/3-1-22-a-shviti-for-hitbonenut-contemplation/
11 Goldsmith, Joel; The Art of Meditation; © 1956 by Joel Goldsmith; HarperCollins, publishers; p. 127-8
12 ibid., p. 128
13 Buber, Martin; The Legend of the Baal Shem; Schocken, © 1955; p. 26-7 (original © 1907)
14 Bereishith/Genesis Rabbah 68:9 and elsewhere.
15 from the Ohr Sameach website https://ohr.edu/ask_db/ask_main.php/37/Q1/
16 https://www.myjewishlearning.com/article/the-place-with-no-name/
17 Blake, William; Auguries of Innocense