Why does one need literary, contemplative, and real mark prajña? Sakyamuni Buddha spoke four lines of verse which those who study the Vajra Sūtra should regularly recite:

All conditioned phenomena
Are like dreams, illusions, bubbles, shadows,
Like dew drops and a lightning flash:
Contemplate them thus.

Everything is conditioned phenomena. Eating, wearing clothes, walking, standing, sitting, lying down, running a business – all activities are conditioned phenomena. Those are examples of external conditioned phenomena. There are also the Five Skandhas – form, feeling, thought, activities, and consciousness – which are conditioned phenomena. The four principal elements – earth, water, fire and wind – are conditioned phenomena. The six roots, the six dusts, the twelve places, and the eighteen realms are all conditioned phenomena. All those phenomena, whether external or internal, are like dreams, illusions, bubbles, shadows.

What is a dream? No one knows. If we knew then we would not dream. People are in a perpetual dream. When you fall asleep and dream, you are unaware of the things which exist in your ordinary waking state, and when you awaken from the dream, you usually cannot remember the events of the dream. In the same way, we are unable to remember the events of our former lives, because they have disappeared in this present life’s dream.

Someone may have a dream in which he becomes wealthy, is appointed an official, and is on the verge of becoming president, when suddenly someone else says to him, “Sir, you are actually having a dream.” But in the midst of his dream of riches and position, the person cannot believe what he is told.

“Everything that is happening to me is real,” he says, “I am wealthy, I am an official, I am a candidate for president. How can you say that I am dreaming?” However, when he awakens from his dream, he will know without being told that all those events happened in a dream.

So too we people are as if in a dream. Now I will tell you: this is a dream. Although I have told you, surely you will reply, “What do you mean, a dream? This is all real. These things are actually happening. How can you say it is a dream? You cheat people.”

When your cultivation is accomplished, you will awaken from this dream and know without being told that everything you did in the past was a dream. The reason you do not believe me when I tell you that you are dreaming is that you still have not awakened from your dream. When you awaken you will agree, “Yes, it was all a dream.” …

When you understand the Buddhadharma you know that everything is empty and illusory. The world is empty and illusory, realized from a conflux of conditions which only seem to be real. When you do not understand the Buddhadharma, you are like the child or the fool who considers everything to be real. This is not to belittle people! It is a simple fact. People who do not understand the Buddhadharma think that being wealthy is real and think that official positions actually exist. In actuality, everything is one. A person is the same whether he is rich or impoverished. If you understand that everything is empty and illusory, then you cannot be confused by anything. You will not become attached to unreal states.