Theories based on the desire for happiness would have us believe that anything is possible. According to Vajrayana however, the desire for happiness is not concomitant with knowledge of the nature of happiness. The desire for happiness and happiness itself are mutually exclusive within any dualistic paradigm. This is due to the fact that attempting to achieve happiness is undertaken in a manner which undermines the possibility of attaining happiness.
p15, Entering the Heart of the Sun and Moon 2nd edition, Khandro Déchen and Ngakpa Chögyam, Aro Books, 2021, ISBN 978-0-9653948-7-1