When he (the eater) offers the fourth oblation, he offers it saying - ‘Samānāya svāhā’ (I offer this as an oblation to samāna). With this, samāna becomes pleased.
When samāna is pleased, the mind is pleased; when the mind is pleased, the cloud is pleased; when the cloud is pleased, lightning is pleased; lightning being pleased, whatever is under the control of lightning and the cloud 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.