Out to the woodpile again. I’m reminded that the wood out there, though under cover, is damp with all the rain and wind and muck there’s been in the high Cotswolds recently. So bring it in, leave it in the garage for a few days, then by the fire for a day or two more. Then on to the fire and watch it burn. That at least is the theory and tonight it’s been more than theory. The room heated, and we did with it, to new levels.

A pub meal this evening. No street lights round here and heavy cloud cover and somehow the lights on the urban horizon which normally take the edge off the dark sky perfection I love weren’t there. So we had a dark dark sky. But no stars. Just the wind and the blackness and rain whipping in.

Darkness. There’s a marvellous exhibition at the Wellcome Collection, Tibet’s Secret Temple – Mind Body Spirit in Tantric Buddhism. Hold onto your seats. What follows may be unsettling.

The temple, the Lokhang, is on an island behind the Potala Palace in Lhasa, built by a Dalai Lama in the 17th century, as a refuge and to propitiate the ‘elemental serpentine forces that Tibetans call lu’.  Wall-paintings in its uppermost chamber illustrate the Dzogchen, or ‘Great Perfection’ teachings of the 8th century Tantric master, Padmasambhava, and they are the subject of and inspiration behind the exhibition.

And they set me thinking – and take me to the darkness.

The high mountain light in an often treeless terrain has sharpness and brilliance and a stillness I’d associate with transcendence, but the rapture we’d feel as Westerners in that landscape isn’t the rapture of a Tibetan Buddhist. It’s no more than a stepping-stone: to move beyond the dualism of light and dark we have to experience dark as well as light. The darkness of a temple. And the darkness of Tantric practices associated with death, making us aware of the transitoriness of existence. Skulls and thigh bones feature. The Tibetan Book of the Dead focuses on experience in the bardo state between death and reincarnation.

My instincts rebel against this, but there’s a strict method in this apparent madness. To move beyond dualism we have to experience and move beyond fear – we have to transcend all human existence, and that takes us down to the depths and up to the heights of experience – the high mountains may open a door, but they’re not sufficient in themselves.

I’m only here touching on ideas of light and dark, no more than scratching along the surface of Tantric Buddhism. It encompasses so much more – stillness and movement, the trul khor and the six yogas – including the Yoga of Radiant Light.

Having started this post in the darkness of a Cotswold night I’ll end here – in the transcendent light of the Himalaya.

You can’t ask for more than that.