Each time you breathe in, try to feel that you are bringing into your body infinite peace. When you breathe out, try to feel that you are expelling the restlessness within and all around you.
After practising this a few times, try to feel that you are inhaling power from the universe. When you exhale, feel that all your fear is leaving your body. After doing this a few times, try to feel that what you are breathing in is infinite joy, and what you are breathing out is sorrow, suffering and depression.
There is also something else you can try. Feel that you are breathing in not air, but cosmic energy. Feel that there is not a single place in your body that is not being filled by cosmic energy. It is flowing like a river inside you, washing and purifying your whole being. Then when you start to breathe out, feel that you are breathing out all the rubbish inside you - all your undivine thoughts, obscure ideas and impure actions.
Keep your eyes half open and imagine the vast sky. In the beginning try to feel that the sky is in front of you; later try to feel that you are as vast as the sky, or that you are the vast sky itself.
After a few minutes please close your eyes and try to see and feel the sky inside your heart. Please feel that you are the universal heart, and that inside you is the sky that you meditated upon and identified yourself with. Your spiritual heart is infinitely vaster than the sky, so you can easily house the sky within yourself.
(Video: Sri Chinmoy wrote many meditative aphorisms that can be used as visualisation exercises. For example, this video features a series of Sri Chinmoy's aphorisms on the theme 'Imagine', along with beautiful photographs of nature.5)
Visualisation exercise: the heart rose
Kindly imagine a flower inside your heart. Suppose you prefer a rose. Imagine that the rose is not fully blossomed; it is still a bud. After you have meditated for two or three minutes, please try to imagine that petal by petal the flower is blossoming. See and feel the flower blossoming petal by petal inside your heart. Then, after five minutes, try to feel that there is no heart at all; there is only a flower inside you called 'heart'. You do not have a heart, but only a flower. The flower has become your heart or your heart has become a flower.
After seven or eight minutes, please feel that this flower-heart has covered your whole body. Your body is no longer here; from your head to your feet you can feel the fragrance of the rose. If you look at your feet, immediately you experience the fragrance of a rose. If you look at your knee, you experience the fragrance of a rose. If you look at your hand, you experience the fragrance of a rose. Everywhere the beauty, fragrance and purity of the rose have permeated your entire body. When you feel from your head to your feet that you have become only the beauty, fragrance, purity and delight of the rose, then you are ready to place yourself at the Feet of your Beloved Supreme.