Simply So, by Ajaan Sim Buddhacaro, translated from the Thai by Jayasaro Bhikkhu (1995; 43k/14pp.)
Two short talks on the practice of meditation: The first describes the use of the meditation-word "Buddho" to develop mental tranquillity; the second reminds us of the urgency of meditation practice and offers advice on how to resist the mind's many tempting tricks that might lure us away from practice.