You might know of the spiritual practice of japa which falls under the banner of Mantra Yoga. Japa involves the meditative repetition of a mantra or name of God. The mantra or may be whispered, spoken, sung or mentally repeated. A mala or rosary is used.
Likhit japa is written mantra.
Any mantra may be written. All you need is a small book, a pencil & ten minutes minimum. Set yourself up in a quiet place, light a candle & incense, ring a little bell. Settle the body, recall your sankalpa & pick up your pencil. When writing use very small writing, try to keep it neat & write in lines. Whilst you write try to focus the mind on the mantra by mentally or verbally saying it & looking at the symbol. This will tune you in to the sublime vibration of the mantra. You can devote an entire book to likhit japa. When not in use it is best stored in or on your altar, somewhere safe & dry or under your pillow.
In Mantra writing, there is no restriction about any particular script. It may be written in any language.
"The benefits of Mantra-writing or Likhit Japa cannot be adequately described. Besides bringing about purity of heart and concentration of mind, mantra-writing gives you control of asana, control of indriyas/senses, particularly the sight and the tongue, and fills you with the power of endurance. You attain peace of mind quickly. By prolonged and constant practice the inherent power of the Mantra (Mantra-Sakti) will be awakened, which will fill your very existence with the Divinity of the Mantra" ~ Swami Sivananda.
Children love doing likhit japa. It develops focus, concentration, positivity & creativity. Children should be given poetic licence to do likhit japa anyway they wish. For example, if doing om, some big, some little, different colours, textures, painting ... Sometimes I will write a big om & Indira will write little om's inside or colour it in using crayon. Collages are also a great way of doing likhit japa with children.
For a detail essay on japa, likhit japa & it's instruction see Sivananda's page.
