From the Dhammapada:

CHHÖ KÜN MI LAM GYU MA DRA
DEN PÄI NGO WO CHI YANG ME
ME KYANG NANG WÄI NGÖ PO LA
NGÖN PAR ZHEN PA ME JE ANG

All phenomena are like a dream or an illusion.
A true essence does not exist whatsoever,
It doesn’t exist,
So don’t cling to appearing phenomena.

Normally I recite this verse when I am doing sur practice for the people who have died. Sur is making offerings to Guru, Buddha, Dharma and Sangha, and to all kinds of sentient beings, all the landlords, but particularly for people who have died and haven't found rebirth yet, so they are born in the intermediate state. Sur is offering smell to them. It is food for them, the smell. It is not the smell of incense. It has to be food, like tsampa, barley [flour]. You burn tsampa and it has the smell of food. It has to be like that.

I recite this verse when I am doing sur. This is a teaching on emptiness for the spirits and the smell-eaters.

It is also very good to recite this verse when you go for a walk. You can repeat it as you are walking. Recite or remember it and at the same time you can do the meditation when you are walking. So then your walking becomes a remedy to samsara. It eradicates the root of samsara, the ignorance from where all the suffering came, from beginningless rebirths, now and that continues in the future. It is eradicating the root of samsara, ignorance.

It is unbelievable, so meaningful for your life. It is a very deep meditation. This kind of mindfulness of emptiness.

Also, you can do [this meditation]—looking at the hallucination as a hallucination—with that mindfulness while you are walking. Walking is just one example, but you can do it while you are making food, cooking in the kitchen, thinking that you are dreaming; you are in a dream making food. Look at it like a dream, like an illusion. While you are making food in the kitchen, while you are busy, you can meditate on emptiness, looking at it as a hallucination as it is a hallucination. While you are busy having meetings, while you are busy being a secretary, having a busy life, part of your mind is in meditation.

Or, merely labeled—merely labeled I, merely labeled action, merely labeled whatever you are doing, all that—practice meditation on emptiness.

Or, nothing exists, what appears as real, all this is nothing. Recite the verse above, or:

NGA CHHÖ CHÄN DEN PAR ME TE TEN DREL YIN PÄI CHHIR
The base is not truly existent because it is a dependent arising.

That is so good, fantastic, to think like this when you are walking. You can do meditation on this, “It has no true existence….” Then, after some time, think, “…because it is a dependent arising.”

You can do it over and over. You go and come back, then your life becomes most meaningful.

Instead of OM MANI PADME HUM, OM MANI PADME HUM, reciting mantras, you can recite these quotations of the Buddha, quotations of the Buddha's teachings, any of the words on emptiness that I mentioned.

Instead of a mantra, you can recite the Buddha’s quotations when you are walking, when you are driving a car [or doing any kind of mundane activity.] While you are cooking food you can do that so it reminds you of that meditation. So it is very good.

Also you can chant the verses. It is very good to chant them; it brings your mind in meditation.