14.18 Thus, in the manner explained, those who 'rest in Sattva rise upwards,' namely, they attain liberation from the bonds of Samsara gradually. Those who, 'abiding in Rajas' which produces greed for heaven etc., engage themselves in actions which constitute the means for obtaining such results. Experiencing those results, they are born again and engage in, and perform, the very same acts. So they remain in the 'middle'. This is mostly suffering, as it is characterised by rirths. Those of Tamasic nature 'stoop down' into lower levels, as Tamas grows ever worse in them. They go 'downwards' i.e., to the lowest state among human beings, then to the condition of animals; then to that of worms; insects etc., then of immovable things, and even to the condition of shrubs and creepers, and ultimately to the condition of stones, wood, clod of earth, straw etc. Sri Krsna now teaches about the manner of those in whom the Sattva has gradually increased by adopting special holy food and performance of special disinterested deeds, and who thus rise upward by transcending the Gunas.