In present Kali Yuga attaining moksha salvation is possible only through jnana yoga, never path of bhakti yoga or karma yoga alone. In earlier times attaining moksha salvation was possible through path of bhakti yoga alone but not now. The level of submission required in bhakti yoga is missing today. Indulgence in nishkama karma yoga is necessitated both when indulging in bhakti yoga or jnana yoga.
Nishkama karma yoga spells the need to work like a trustee, caretaker for whom everything all the time belonged to God Almighty. One was only an instrument of God doing his bidding all the time. A nishkama karma Yogi all the time offered fruits of karma performed to God. This also was an abstract reality. Why?
The cosmic journey of life all the time belonged to the spirit, consciousness existing in our heart and never the manifest physical human form. Our soul atman existing in heart is the real master and controller of human body. It is not with capacity of human body to manifest a soul atman.
The state of moksha salvation is reached when human beings gained enlightenment followed by moksha salvation. Human beings gaining enlightenment means becoming a pure soul atman forever! This becomes possible when indulging in spirituality human beings initially demolished their ego in totality. Furthermore established total control over five senses and mind!
Practicing absolute celibacy for a minimum period of 12 years in continuation seekers finally succeed in full awakening of kundalini shakti, the coiled Serpentine energy lying dormant in base of spine. Full awakening of kundalini activates brain to full capacity 100%.
For human beings to demolish their ego, establish control over five senses and mind the jnana wisdom contained in Bhagavad Gita is necessitated. And to understand Bhagavad Gita one needs indulging in contemplation (chintan) most of time. Indulgence in Bhagavad Gita relates to path of jnana yoga as it is only jnana wisdom in Bhagavad Gita that can cut darkness of ignorance, demolish all queries within us in totality.
Indulging in path of bhakti yoga or nishkama karma yoga alone one could never understand gist of Bhagavad Gita and in absence of jnana wisdom contained in Bhagavad Gita one could not succeed demolishing ego in totality and also overpowering five senses and mind in totality.
Indulgence in Bhagavad Gita in present times is the only path towards God. In present times one can reach God only through Bhagavad Gita, never any other scripture existing in world. As nothing in Bhagavad Gita could be deciphered literally, it demands indulgence in jnana yoga all the time.
Sri Ramakrishna Paramhansa initially started his search of God via path of bhakti yoga and karma yoga but realizing he could never reach God that way he finally switched to path of jnana yoga.