When he (the eater) offers the third oblation, he offers it saying - ‘Apānāya svāhā’ (I offer this as an oblation to apāna). With this, apāna becomes pleased.
When apāna is pleased, the organ of speech is pleased; the organ of speech being pleased, fire is pleased; when fire is pleased, the earth is pleased; the earth being pleased, whatever is under the control of the earth and fire is pleased. Then when that is pleased, the eater derives pleasure from his children, from his animals, from an abundance of food, from physical strength, and from his good -life and scholarship.