Other people's views and troubles can be contagious. Don't sabotage yourself by unwittingly adopting negative, unproductive attitudes through your associations with others.
EpictetusIf your heart is quite set upon a crown, make and put on one of roses, for it will make the prettier appearance.
EpictetusIf we are not stupid or insincere when we say that the good or ill of man lies within his own will, and that all beside is nothing to us, why are we still troubled?
Epictetus