A beautiful face is a mute recommendation.

A fair exterior is a silent recommendation

Art has a double face, of expression and illusion, just like science has a double face: the reality of error and the phantom of truth.

Do not turn back when you are just at the goal.

Never thrust your own sickle into another's corn.

One ungrateful man does an injury to all who are suffering. [Lat., Ingratus unus miseris omnibus nocet.]