O blessed and happy spirit whence comest thou?

Envy must be represented with a contemptuous motion of the hand
towards heaven, because if she could she would use her strength
against God; make her with her face covered by a mask of fair
seeming; show her as wounded in the eye by a palm branch and by an
olive-branch, and wounded in the ear by laurel and myrtle, to
signify that victory and truth are odious to her.
Many thunderbolts should proceed from her to signify her evil speaking.
Let her be lean and haggard because she is in perpetual torment.
Make her heart gnawed by a swelling serpent, and make her with a quiver with
tongues serving as arrows, because she often offends with it. Give
her a leopard's skin, because this creature kills the lion out of
envy and by deceit. Give her too a vase in her hand full of flowers
and scorpions and toads and other venomous creatures; make her ride
upon death, because Envy, never dying, never tires of ruling. Make
her bridle, and load her with divers kinds of arms because all her
weapons are deadly.

Toleration.

Intolerable.

No sooner is Virtue born than Envy comes into the world to attack
it; and sooner will there be a body without a shadow than Virtue
without Envy.

O blessed and happy spirit whence comest thou? Well have I known
this man, much against my will. This one is a receptacle of
villainy; he is a perfect heap of the utmost ingratitude combined
with every vice. But of what use is it to fatigue myself with vain
words? Nothing is to be found in them but every form of sin ... And
if there should be found among them any that possesses any good,
they will not be treated differently to myself by other men; and in
fine, I come to the conclusion that it is bad if they are hostile,
and worse if they are friendly. 

The Notebooks of Leonardo da Vinci