The window is the absence of the wall, and it gives air and light because it is empty. Be empty of all mental content, of all imagination and effort, and the very absence of obstacles will cause reality to rush in.
Sri Nisargadatta MaharajJust keep in mind the feeling 'I am', merge in it, till your mind and feeling become one. By repeated attempts you will stumble on the right balance of attention and affection and your mind will be firmly established in the thought-feeling 'I am'. Whatever you think, say, or do, this sense of immutable and affectionate being remains as the ever-present background of the mind.
Sri Nisargadatta MaharajI simply followed (my teacher's) instruction which was to focus the mind on pure being 'I am', and stay in it. I used to sit for hours together, with nothing but the 'I am' in my mind and soon peace and joy and a deep all-embracing love became my normal state. In it all disappeared -- myself, my Guru, the life I lived, the world around me. Only peace remained and unfathomable silence.
Sri Nisargadatta MaharajI do not suffer; I cannot suffer because I am not an object. Of course there is suffering. But do you realize what this suffering is? I am the suffering. Whatever is manifested, I am the functioning. Whatever is perceptible I am the perceiving of it. Whatever is done I am the doing of it; I am the doer of it, and, understand this, I am also that which is done. In fact, I am the total functioning.
Sri Nisargadatta Maharaj