"one single, elegant equation to explain everything"...

BV=100%*(Lo*Le*Leg)

while there is life, there is hope, no matter how many obstacles you face (or how difficult they are)...the ONLY IMPORTANT THING is to give 100% in LoLeLeg...just keep going...

or in other words...

BV = 100% * Lo * Le * Leg

BV = 100% * Lo * (5Cs) * Leg 
BV = 100% * Lo * (5Cs) * Leg 
BV = 100% * Lo * (5Cs) * Leg 

BV = + (G.S.B) - (su.ad.av)

......100% GSB