What does "The Earth seemed too earthy for him" suggest?

His name was Iswar. He had been a village schoolmaster before. He was a prim, proper and sedately dignified personage. The Earth seemed too earthy for him, with too little water to keep it sufficiently clean; so that he had to be in a constant state of warfare with its chronic soiled state. He would shoot his water-pot into the tank with a lightning movement so as to get his supply from an uncontaminated depth. It was he who, when bathing in the tank, would be continually thrusting away the surface impurities till he took a sudden plunge expecting, as it were, to catch the water unawares. When walking his right arm stood out at an angle from his body, as if, so it seemed to us, he could not trust the cleanliness even of his own garments. His whole bearing had the appearance of an effort to keep clear of the imperfections which, through unguarded avenues, find entrance into earth, water and air, and into the ways of men. Unfathomable was the depth of his gravity. With head slightly tilted he would mince his carefully selected words in a deep voice.

This erstwhile schoolmaster had discovered a way of keeping us quiet in the evenings. Every evening he would gather us round the cracked castor-oil lamp and read out to us stories from the Ramayana and Mahabharata. Some of the other servants would also come and join the audience. The lamp would be throwing huge shadows right up to the beams of the roof, the little house lizards catching insects on the walls, the bats doing a mad dervish dance round and round the verandahs outside, and we listening in silent open-mouthed wonder.