Barack Obama says you should embrace ` relentless optimism ' to be successful . 
When the going gets rough , a pep talk from former president Barack Obama may come in handy . 
When it 's time for you to confront future hurdles , roadblocks and disappointment and when others are "purposefully undermining efforts you know can make a difference ," there is only only way to respond , Obama says , if you want to be successful . 
A day after president Donald Trump 's downcast speech on terrorism and political adversaries during the U.N. General Assembly -LRB- UNGA -RRB- , Obama discussed the power of optimism at the inaugural Bill & Melinda Gates Foundation 's "Goalkeepers" event . 
In his speech , Obama notes the world 's challenges , including growing economic inequality , a changing climate , mass migration and the rise of nationalism and xenophobia .
When the going gets rough , a pep talk from [TGT] may come in handy . 
When it 's time for you to confront future hurdles , roadblocks and disappointment and when others are "purposefully undermining efforts you know can make a difference ," there is only only way to respond , [TGT] says , if you want to be successful . 
A day after president Donald Trump 's downcast speech on terrorism and political adversaries during the U.N. General Assembly -LRB- UNGA -RRB- , [TGT] discussed the power of optimism at the inaugural Bill & Melinda Gates Foundation 's "Goalkeepers" event . 
In his speech , [TGT] notes the world 's challenges , including growing economic inequality , a changing climate , mass migration and the rise of nationalism and xenophobia .