Luv-Kush, Shubha-Labha, Riddhi-Siddhi are inseparable pairs of Vedanta. They signify that you cannot get one without the help of the other.
Kush is a symbol of purity and Luv symbolize the
spiritual love. To achieve love one has to be pure in consciousness. To acquire
love and inner happiness in life, one may have to use kush, a herb, in daily
life. No traditional Hindu ritual is complete without the use of kush
In Riddhi-Siddhi, Riddhi is knowledge and Siddhi is perfection. An obstacle-free life (represented by Ganesha) can be attained only when one masters or tames both knowledge and perfection.
Riddhi and Siddhi are the two inseparable wives of Lord Ganesha.
Some symbolize Siddhi as success and Riddhi as prosperity or Riddhi as material abundance and Siddhi as the intellectual and spiritual prowess or Riddhi as prosperity and Siddhi as progress. All are dependent on each other.
Ganesha is said to have two sons, Shubha-Labha. Again the two terms are inseparable from each other. Both the words are written during Diwali on each account book. Shubha is auspiciousness and Labha, profit.
Ram Lakshman are often spoken of as Ram-Lakhan, which signifies that to be in touch with consciousness (Rama) one has to control the mind with an aim (Mana with a Lakshya).
Other pairs, which are inseparable, are the duals of Rama and Sita, Radha and
Krishna, Shiva and Parvati, Brahma and Saraswati and
Vishnu and Lakshmi.
In Rama-Sita, Rama signifies soul consciousness and Sita, the body. It is true for the
Krishna and Radha combination. They also signify the dual
character of the nature, feminine and masculine natures.
In Brahma and Saraswati, Brahma represents creativity or innovations and Saraswati the art of acquiring pure knowledge. Again both are dependent on each other.
Lakshmi and Vishnu are again inseparable. Vishnu or
is the doer and performer. They signify action in the present. Lakshmi signifies
material and spiritual benefits. One can only get the benefits by action in
Shiva-Parvati is other inseparable word used in Vedic literature. The other is Shiva and Shakti. They represent the true nature of the consciousness, the male and the female energies; the purusha and the prakriti. In terms of computer language, they represent the operational and the application software. No computer can run without both of them. One is knowledge or the information and the other is energy.
Other uncommon pairs are Bharata and Shatrughana of Ramayana. Bharata represents bhakti, devotion and discipline and Shatrughana, victory over the enemy. To win over the Shatru, one has to become Bharata.
In Mahabharata, there is the pair of Nakul (being neutral) and Sahdeva (helping every one). Again they are inseparable. You cannot help unless you are neutral.
The pairs of modern post Vedic era are Heer-Ranjha; Laila-Majnu, Sheeri-Farhad, Banti and Babli and Veer-Zara. They all symbolize human love relationship.