This happens because the first symptoms of this precious energy arising cannot be perceived when not 'at home' here and now. Reflecting on what in such 'fired' states we have done and are doing to each other and to the earth we live on, may help us to understand why much training is necessary to wean us from our own excuses and to 'gentle the Fires'. Well, as above, learning to stay 'at home' and thus becoming aware of any tensing up which heralds an emotional eruption. When it arises, rather than trying to evade or control the energy, the effective means is to 'catch it' i.e. fold the hands and bow, 'Precious energy arising, I am still here, please burn me away', to make house room for it in one's heart and body, 'take it to heart' as it were, and there willingly and patiently endure its burning, cleansing and purifying. That is what 'Purification by Fire' really means.
Many religions have the ritual of guarding fire, guarding a flame.
What a magnificent metaphor this is, and how accurately perceived. Outer or inner 'fire', if left unguarded, can break into a devastating conflagration. But as for warmth and light, the gentle fire of the hearth or the lamp that lights our darkness are symbols that reach back to the dawn of our species. No wonder, therefore, that I find the seemingly simple giving myself so very difficult. To 'undergo', then, is to give myself over to the Way and with I, the delusion, thus being given over or away, the real self or True Nature can manifest.