Nagarjuna (2nd Century)
There is only one wrong view:
To believe, that your view is the only right one.
...
For whom emptiness is possible,
everything is possible.

Chandrakirti (600-650)
Those who have ignorance will engage in bad karma and go to hell.
Those who have ignorance will create good karma and go to heaven.
Those who are wise will go beyond karma, and attain liberation.

Dawa Gyaltsen (8th century)

Appearance is mind.
Mind is empty.
Emptiness is clear light.
Clear Light is union.
Union is great bliss.

Virupa (9th century)

Appearance is mind.
Mind is illusion.
Illusion is inexpressible.

Tilopa (988-1069) (to Naropa)

Oh my Son!
Appearances of phenomena do not bind you to samsara,
but attachment to them does.
So, Naropa, cut off attachment.

Sachen Kunga Nyingpo (as spoken to him by Manjushri) (1092-1158)
If you are in love with this life, you are not a true spiritual practitioner.
If you are in love with samsara, you do not have renunciation.
If you are in love with your own benefit, you have no bodhichitta.
If you have the mental factor "in love" , you do not have the View.
(as translated by Dzongsar Khyentse Rinpoche, Kathmandu 2009)

Drogon Tsangpa Gyare Yeshe Dorje (1161–1211)

The three fierce mantras:
Whatever has to happen, let it happen!
Whatever the situation is, it's fine!
I really don't need anything!

Longchen Rabjam (1308-1368)

Turn your Mind to the Dharma.
The Dharma becomes the Path.
The Path transforms Confusion.
Confusion dawns as Primordial Awareness.

H.H. Dilgo Khyentse Rinpoche (1910-1991)
Do not forget the Lama, pray to him at all times.
Do not be carried away by thoughts, watch the nature of mind.
Do not forget death, persist in Dharma.
Do not forget sentient beings, with compassion dedicate your merit to them.s

Dzongar Jamyang Khyentse Rinpoche (born 1961)
When you don't have obsession,
when you don't have hang-ups,
when you don't have inhibition,
when you are not afraid
you will be breaking certain rules,
when you are not afraid
you will not fulfill somebody's expectations,
what more enlightenment do you want?
That's it.