In one sense, we are all mentally afflicted, in the sense that everybody's mind is illusioned by some desire or ambition. Whatever our desire or ambition, our mind carries our self to a next life that will facilitate fulfilling that desire. The Bhagavad-gita describes yoga as that process by which we free the mind from all conditioning and all illusions. So even the mentally ill or disabled can perform this yoga. The speaker of Bhagavad-gita describes the yoga to be engaging all the senses including the mind in focusing on the Absolute Truth by kirtan (Sanskrit term for chanting of God's names).
My understanding of reincarnation is that your frame of mind in this life effects how your next one. Those with disabilities and mental illness cannot help their frame of mind. Are they therefore doomed to a less desirable future existence?
The Hindu Perspective
by Ayush Goyal
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Hindu The Bhagavad Gita According to Gandhi Mohandas K. Gandhi Hindu Introducing Hinduism: A Graphic Guide Vinay Lal and Borin Van Loon Hindu The Illustrated Encyclopedia of Hinduism Rasamandala Das Hindu The Upanishads Eknath Easwaran Hindu The Essentials of Hinduism: A Comprehensive Overview of the World's Oldest Religion Swami Bhaskarananda Hindu The Bhagavad Gita Eknath Easwaran Hindu Hinduism Swami Vivekananda Hindu Hinduism: A Path to Inner Peace Mohan R. Pandey