The first of the two verses is descriptions in worldly terms, the second of the two contains two lines which are spiritual, and two worldly but may be interpreted as spiritual. So the first verse refers to mundane right view, and the second to transcendent right view (MN 117).
looking after oneself:
"This being said, the assistant Medakathalika said this to the bamboo acrobat:
“That will not do at all, master! You look after yourself, master, and I will look after myself.
Thus with each of us looking after ourselves, guarding ourselves, we’ll show off our craft, receive some payment, and safely climb down from the bamboo pole.That’s the right way to do it!”—SN 47.19
“Grain” refers to impermanence:
 “And further… just as if a sack with openings at both ends were full of various kinds of grain—wheat, rice, mung beans, kidney beans, sesame seeds, husked rice—and a man with good eyesight, pouring it out, were to reflect, ‘This is wheat. This is rice. These are mung beans. These are kidney beans. These are sesame seeds. This is husked rice,’ in the same way, the monk reflects on this very body from the soles of the feet on up, from the crown of the head on down, surrounded by skin and full of various kinds of unclean things: ‘In this body there are head hairs, body hairs, nails, teeth, skin, flesh, tendons, bones, bone marrow, kidneys, heart, liver, pleura, spleen, lungs, large intestines, small intestines, gorge, feces, bile, phlegm, pus, blood, sweat, fat, tears, skin-oil, saliva, mucus, fluid in the joints, urine.’—MN 10
“Rain” is code for the four qualities of a stream entrant:
“Mendicants, suppose it rains heavily on a mountain top, and the water flows downhill to fill the hollows, crevices, and creeks. As they become full, they fill up the pools. The pools fill up the lakes, the lakes fill up the streams, and the streams fill up the rivers. And as the rivers become full, they fill up the ocean. In the same way, a noble disciple has experiential confidence in the Buddha, the teaching, and the Saṅgha, and the ethics loved by the noble ones. These things flow onwards; and, after crossing to the far shore, they lead to the ending of defilements.”—SN 55.38