A free e-book on mindfulness , 'Mindfulness in Plain English' by Ven. Henepola Gunaratana (Buddhist author and monk from the Theravada tradition) Mindfulness in Plain English by Ven. Henepola Gunaratana Some excerpts from the book...
As an introduction to the concept? A delightful wee book by Thich Nhat Hanh - The Miracle of Mindfulness
This may not seem possible for many. But along with other concepts. Could cure many of the worlds ills.
'Action in the Instant Present ' by N.Sriram, who was the president of the Theosophical Society (1953-1973). https://www.theosophy.world/sites/default/files/articles/Action in the Instant Present - N. Sri Ram.pdf Some insightful sayings from the book...