Tat Tvam Asi is a Sanskrit phrase, translated as Thou art that, (That thou art, That art thou, You are that, or That you are, or You are it) and is one of the four Grand Pronouncements of the Upanishads.

The meaning of this saying is that the Self in its original, pure, primordial state is wholly or partially identifiable or identical with the Ultimate Reality that is the ground and origin of all phenomena.

O Supreme inner Self, you, the Supreme inner self is that, Supreme inner self. This simply becomes a redundant statement that is trivially true.

There are only this two ways the triviality can go. O Individual self, you are not that Supreme inner self.

In Accusative case sense, it means that the very object and purpose of an Individual self is Supreme self.

In Instrumental case it means that the Supreme inner self or the Lord is instrumental for every action of Individual self.

In Dative case, it means the very goal of Individual self is to reach the Supreme inner self.

In Ablative case, it means the very origin of Individual self is the Supreme Self. It also means that Individual self is eternally dependent on Supreme self.

In Genitive case, it means that Individual self does not own anything as everything belongs to Supreme self. The individual self itself belongs to Supreme self.

In Locative case it means the Individual self is located in Supreme self and thus always seeking support for the very existence.

Thus in every which way, the eternal dependence is indicated.

That in this universe, there is one great energy, and we have no name for it. People have tried various names for it, like God, like Brahman, like Tao, but in the West, the word God has got so many funny associations attached to it that most of us are bored with it. When people say ‘God, the father almighty,’ most people feel funny inside.

Buddhist philosophy, all this universe is one ‘Thatata.’ That means ‘ten thousand functions, ten thousand things, one suchness,’ and we’re all one suchness. And that means that suchess comes and goes like anything else because this whole world is an on-and-off system.

As the Chinese say, it’s the yang and the yin, and therefore it consists of ‘now you see it, now you don’t, here you are, here you aren’t, here you are,’ because that the nature of energy, to be like waves, and waves have crests and troughs, only we, being under a kind of sleepiness or illusion, imagine that the trough is going to overcome the wave or the crest, the yin, or the dark principle, is going to overcome the yang, or the light principle, and that ‘off’ is going to finally triumph over ‘on.’

And we, shall I say, bug ourselves by indulging in that illusion. Hey, supposing darkness did win out, wouldn’t that be terrible! And so we’re constantly trembling and thinking that it may, because after all, isn’t it odd that anything exists? It’s most peculiar, it requires effort, it requires energy, and it would have been so much easier for there to have been nothing at all.

Therefore, we think ‘well, since being, since the ‘is’ side of things is so much effort’ you always give up after a while and you sink back into death. But death is just the other face of energy, and it’s the rest, the not being anything around, that produces something around, just in the same way that you can’t have ‘solid’ without ‘space,’ or ‘space’ without ‘solid.’

When you wake up to this, and realize that the more it changes the more it’s the same thing, as the French say, that you are really a train of this one energy, and there is nothing else but that that is you, but that for you to be always you would be an insufferable bore, and therefore it is arranged that you stop being you after a while and then come back as someone else altogether, and so when you find that out, you become full energy and delight.

And you suddenly see through the whole sham thing. You realize you’re That–we won’t put a name on it– you’re That, and you can’t be anything else. So you are relieved of fundamental terror. That doesn’t mean that you’re always going to be a great hero, that you won’t jump when you hear a bang, that you won’t worry occasionally, that you won’t lose your temper.

It means, though, that fundamentally deep, deep, deep down within you, you will be able to be human, in the pains, difficulties and struggles that naturally go with human existence but to have no hang-ups, that is to say, to be able to drift like a cloud and flow like water, seeing that all life is a magnificent illusion, a plane of energy, and that there is absolutely nothing to be afraid of.

Fundamentally. You will be afraid on the surface. You will be afraid of putting your hand in the fire. You will be afraid of getting sick, etc. But you will not be afraid of fear. Fear will pass over your mind like a black cloud will be reflected in the mirror.