You know what they say: 'variety is the spice of life'. [=life is more interesting and enjoyable when you do different things]
The talks covered a wide/great 'variety of' topics. [=the talks covered many different topics]
I was surprised by the 'variety' of the choices that were available.
(..) The Guardians saw it all. The evil was too great to be left unchecked. And so they gathered the light. They knew of its variety and strength... ...and the light with the most power. But they sought their answer in the light of will... ...to form from it a weapon unequalled... (..)2011 Green Lantern: Emerald Knights