In this way, many varieties of sacrifices have been explained in the Vedas. You should understand that all of them are born of action. Knowing this, you shall be liberated.
Bhagavad Gita - Chapter 4 - Jnana Yoga - The Yoga of Knowledge
O conqueror of the enemy, the sacrifice involving knowledge is higher than the sacrifice of material ingredients. All actions culminate in knowledge, O Partha.
Just try to understand this knowledge by approaching a self-realized person who has seen the truth. Make submissive inquiry and render service unto him. The tattva-darshi, the seer of the truth, will instruct you and give you initiation into this sacred path.
O son of Pandu, understanding this knowledge you will never be subject to illusion again. Through this knowledge you will see the spiritual nature of all living beings and that they are all situated within Me.
Even if you are most impious, you can cross over the ocean of all vices by boarding the boat of wisdom.
As a blazing fire turns wood into ashes, similarly the fire of wisdom renders all karma to cinders, O Arjuna.
There is nothing as pure as knowledge in this world. In due course, one who is perfect in yoga realizes this.
Those imbued with faith and who are devoted to controlling their senses attain this knowledge very swiftly. Thus they attain supreme peace.
Those who are deluded, without faith and full of doubt are ruined. Such faithless people find no happiness in this world or the next.
O Dhananjaya, karma cannot bind one who has renounced action through the process of yoga. His doubts are overcome by knowledge and he has thus realized the nature of the self.