All religions, philosophies, systems and sciences are different fingers pointing at the moon (symbolizing Reality). They do not and cannot encompass Reality. This includes the systems of yoga, tantra and advaita. Realization of the Reality behind our embodied existence can only take place when the sense of ego-identification temporarily dissolves through meditation, reflection, insight, love and being completely focused and absorbed in the present moment.
Swami Nishchalananda 