Perhaps there is no other knowing than the mere competence of the act. If at the heart of one's being, there is no self to which one ought to be true, then sincerity is simply nerve; it lies in the unabashed vigor of the pretense. But pretense is only pretense when it is assumed that the act is not true to the agent. Find the agent.
The hallucination of separateness prevents one from seeing that to cherish the ego is to cherish misery. We do not realize that our so-called love and concern for the individual is simply the other face of our own fear of death or rejection. In his exaggerated valuation of separate identity, the personal ego is sawing off the branch on which he is sitting, and then getting more and more anxious about the coming crash!
You have seen that the universe is at root a magical illusion and a fabulous game, and that there is no separate "you" to get something out of it, as if life were a bank to be robbed. The only real "you" is the one that comes and goes, manifests and withdraws itself eternally in and as every conscious being. For "you" is the universe looking at itself from billions of points of view, points that come and go so that the vision is forever new.
For we have never actually understood the revolutionary sense beneath them – the incredible truth that what religion calls the vision of God is found in giving up any belief in the idea of God.
Buddhism ... is not a culture but a critique of culture, an enduring nonviolent revolution or "loyal opposition" to the culture in which it is involved.
Since opposed principles, or ideologies, are irreconcilable, wars fought over principle will be wars of mutual annihilation. But wars fought for simple greed will be far less destructive, because the aggressor will be careful not to destroy what he is fighting to capture. Reasonable - that is, human - men will always be capable of compromise, but men who have dehumanized themselves by becoming the blind worshipers of an idea or an ideal are fanatics whose devotion to abstractions makes them the enemies of life.
In known history, nobody has had such capacity for altering the universe than the people of the United States of America. And nobody has gone about it in such an aggressive way.
The problem is to overcome the ingrained disbelief in the power of winning nature by love, in the gentle (ju) way (do) of turning with the skid, of controlling ourselves by cooperating with ourselves.