In life there will always be naysayers.
Naysayers in my early life honed my critical thinking skills.
Naysayers at home refine my living in positive ways.
Naysaying students make me think deeply about what I do and why I do it--they often lead me to change my ways.
Naysaying colleagues help me to look deeply at my work.
There's a right quotient of naysaying however as if one is always a naysayer, no one listens, and if the naysaying is for power only, then that contradiction serves to further distance people.
Naysayers can contribute to the greater good, but there's a balance here that's important for all of us to consider.