The stage of warmth. In the way that the presence of heat is an omen for fire， when one approaches the fire of the undefiled wisdom of the Path of Seeing 见道 that scorches the afflictions， one feels the "heat" when he or she reaches to the immediately prior （still defiled） stage of the roots of goodness （us!ma-gata）. Specifically， the first of the four roots of goodness 四善根， where one， meditating on the four noble truths 四谛， practices the sixteen active aspects 十六行相. A level of understanding that is close to the realization of the principle of the four noble truths.