Evagrius of Pontus analysed the thoughts that assail the monk into eight: gluttony, fornication, avarice, sadness, anger, acedia, vainglory and pride. Through John Cassian the list passed to the West, where it became the seven deadly sins. Watchfulness and discernment are the remedies.
Logismoi
The eight evil thoughts of the desert tradition: gluttony, lust, avarice, sadness, anger, acedia, vainglory and pride.
Also: eight thoughts