Science of the Mind
Yoga is the science of the mind. The key text that defines the philosophy is the Yoga Sutra by Patanjali. In 196 very brief sutras (or phrases) Patanjali sets out the eight-step path of Ashtanga Yoga. This is a complete system aimed at taking a person from conditioned experience to spiritual freedom. We are only able to penetrate the deep wisdom contained in these verses thanks firstly to the commentary by the ancient Rishi Vyasa, in which he explained every sutra, and more recent sub-commentaries by authorities like Vachaspati Mishra (ninth century CE).
Cultivating right thoughts & attitudes - bhavana - is key to yoga practice. It is one of the most frequently occurring terms in the Yoga Sutra and a good example is sutra 1.33. Thought creates our 'reality'. e.g Thought creates reality.
Yoga is often portrayed as a series of posture performed on a mat. Whilst this aspect has its place, it could be seen as more of the beginning of a process rather than an end goal. Another way to think of ‘holistic’ Yoga is something that starts once we step off the mat as we apply it in everyday life.
Karma is central to yoga philosophy. Your life is produced by karma; it creates specific situations from which you can learn. It's not accidental, but it is unconscious. The work is to make it conscious.
All of our past actions have determined who we are. All of our current actions determine who we will become. The person we will be tomorrow is based on our thoughts and actions today - we have full ability to choose what we wish for.
Life is packed with meaning and purpose; karma creates that. Yoga helps extract the potential from all experience.