If one attains access concentration or Jhana in Metta and chant the Metta Sutta and Khandha Sutta, will it keep him protected from mosquitos? Would mosquitos still be able to pierce his skin?
These are the benefits of Metta.
Mettāsutta
“Mendicants, you can expect eleven benefits when the heart’s release by love has been cultivated, developed, and practiced, made a vehicle and a basis, kept up, consolidated, and properly implemented.
What eleven? You sleep at ease. You wake happily. You don’t have bad dreams. Humans love you. Non-humans love you. Deities protect you. You can’t be harmed by fire, poison, or blade. Your mind quickly enters immersion. Your face is clear and bright. You don’t feel lost when you die. If you don’t penetrate any higher, you’ll be reborn in a realm of divinity. You can expect eleven benefits when the heart’s release by love has been cultivated, developed, and practiced, made a vehicle and a basis, kept up, consolidated, and properly implemented.”