Trust dies because bad pay poisons him. [ Proverb ]

Deadly poisons are often concealed under sweet honey. [ Ovid ]

There is nothing which so poisons princes as flattery, nor anything whereby wicked men more easily obtain credit and favor with them. [ Montaigne ]

The tree of the world hath its poisons, but beareth two fruits of exquisite flavor, the nectar of poetry and the society of noble men. [ Hitopadesa ]

Society, that distills so many poisons, resembles that serpent of India whose abode is the leaf of the plant that cures its bite: society usually offers a remedy for the sufferings it causes. [ A. de Musset ]

The richest genius, like the most fertile soil, when uncultivated, shoots up into the rankest weeds; and instead of vines and olives for the pleasure and use of man, produces to its slothful owner the most abundant crop of poisons. [ Hume ]