Meditation-yoga helps serenity and stillness of mind, and help a person a deep sense of peace and calm throught meditation.Meditation reduce stress , anxiety and depression and further proper inhalation and exlation of breaths cut down tiredness and asist in good decision making.
Yoga is restraint of thoughts of mind, stillness of mind. Then Self, knower abide in its own nature, which is different from body and mind. Self / spirit is enternal, indestructible, immeasurable where matter is destructible and changes in every second. Mind is changing in every second and thoughts are rising and always thinking and running after the senses. All actions done intentailly or unintentailly has traces in the faculty of mind is called memory.
When the thought is still, self / spirit stand in its own nature, crystal like water, different from the matter. It observed the objects near and thought of mind and refelects its nature according to the faculty of mind. Self / seer thinks that self and body are one and that is cause of pain and sorrow. Due to presence of Ego Self thinks mine wife, mine children, mine wealth and I am doer of all things, whereas it is only illusion. It exists in the form of mental thought.
The veil of ignorance can be remove though proper meditation of the Self. Moral principles, observances, breath control, belief on you God and scriptures and with ascetice practice, ignorance is melted and one can enjoy limitless bless and liberation.