Are the Buddhist sutras 100% verified if applied in life?
In the real quote (here), the Buddha emphasized believing in that which: 


"when adopted &amp; carried out, does not lead to harm &amp; to suffering"
and
"when adopted &amp; carried out, leads to welfare &amp; to happiness".


Therefore, you can trust the majority of the sutras because the majority (but not all) are about giving up harm &amp; suffering and cultivating welfare &amp; happiness. 

The Buddha wanted his followers to investigate &amp; realise the teachings for themselves.