Why few people smile In a difficult situation when others become speechless? 

In a particular situation some people become speechless and some smile. 

Yes, I am talking about that type of difficult situation, when nothing is in our hand but then also we have to suffer without doing any mistake. 

Knowledgeable persons set some principle to live their life in their own way. They know what is not in their hand and if any mistake has  taken place which is not committed by him then he will not blame  himself!