What is the Definition of Energy?

The Blessed Buddha once said:
What, Bhikkhus, is the ability of Energy? Here, Bhikkhus, the Noble Disciple lives
with energy aroused for the elimination of disadvantageous mental states and for
gaining a firm foundation in advantageous states. He is determined, resolute in all
his efforts, not evading any good opportunity to train advantageous mental states.
This is called the ability of Energy.  Source: Samyutta Nikāya V 48

Without Energy, there is neither advantageous action, nor effort!
Without any advantageous action, there is neither any good result!
No cause gives no effect! Therefore: Raise and stir up yourself!

For details on the Enthusiastic Ability of Energy see:
http://What-Buddha-Said.net/drops/III/The_Definition_of_Energy.htm
http://What-Buddha-Said.net/drops/III/The_Arising_of_Energy.htm
http://What-Buddha-Said.net/drops/III/The_Ability_of_Energy.htm
http://What-Buddha-Said.net/drops/III/The_Origin_of_Energy.htm
http://What-Buddha-Said.net/drops/Enthusiastic_is_Energy.htm
http://What-Buddha-Said.net/drops/III/Power_of_Energy.htm
http://What-Buddha-Said.net/drops/III/Ballanced_Energy.htm
http://What-Buddha-Said.net/drops/III/The_Chief_Hero.htm
http://What-Buddha-Said.net/drops/III/Energetic_Effort.htm
http://What-Buddha-Said.net/drops/III/Avoiding_Effort.htm
http://What-Buddha-Said.net/drops/III/Feeding_Energy.htm
http://What-Buddha-Said.net/drops/III/Energy_Viriya.htm
http://What-Buddha-Said.net/drops/III/Dual_Energy.htm