All the harm, fear, and suffering in the world are caused by attachment to the self: Why should I hold on to this great demon?
ShantidevaWhatever happens, I will not let my cheerfulness be disturbed. Being unhappy won't get me anywhere and will dissipate all my goodness. Why be unhappy about something if you can change it? And if you can't, how will being unhappy help?
ShantidevaAll the happiness there is in this world Arises from wishing others to be happy. And all the suffering there is in this world Arises from wishing oneself to be happy.
ShantidevaIf the problem can be solved why worry? If the problem cannot be solved worrying will do you no good.
Shantideva