Remove the Ego and Avidya (Ignorance) is gone. Look for it, the ego vanishes and the real Self alone remains.

When your real, effortless, joyful grateful nature is realized, it will not be inconsistent with the ordinary activities of life.

All unhappiness is due to the ego. With it comes all your trouble. If you would deny the ego and scorch it by ignoring it you would be free.

Apart from the body does the world exist? Has anyone seen the world without the body?

Concentration is not thinking of one thing. On the contrary, it is excluding all thoughts, since all thoughts obstruct the sense of one's true being. All efforts are to be directed simply to removing the veil of ignorance. Concentrating the mind solely on the Self will lead to happiness or bliss. Drawing in the thoughts, restraining them and preventing them from straying outwards is called detachment (vairagya). Fixing them in the Self is spiritual practice (sadhana). Concentrating on the heart is the same as concentrating on the Self. Heart is another name for Self.

All are seeing God always. But they do not know it.

Nearly all mankind is more or less unhappy because nearly all do not know the true Self. Real happiness abides in Self-knowledge alone. All else is fleeting. To know one's Self is to be blissful always.