The mosquito is the cause of our enlightenment: Lama Yeshe
Concentrate on the mosquito that is biting us and think, "The numberless buddhas are born from bodhisattvas, and the bodhisattvas are born from bodhicitta. The loving compassion thought, bodhicitta, is received from each sentient being. It is received from this mosquito who is biting me now." So now, think, "My entire happiness is completely received from this mosquito." If we think like this, it is unbearable to kill the mosquito.