Hindoeïsme

Agni

Agnideva (God of Fire) is one of another form of God Shiva 
  Agnidevi-Svaha (Goddess of Fire) is one of another form of Goddess Durga

Agni is Shiva and Durga! Agni burns in every hearts
Agni is divine and eternal
Agni is the Universe, Agni is the Nectar of life
Agni feed us with energy 
Agni is very beautiful
Agni is the medicine of healing
Agni is the Power of Life! Agni is the Power of Love!
Agni is the Oceaan of Love! Agni Protect us with Love!
Agni is Bhakti, Shakti, Mukti! And we are living in the Heart of Agni! 

MahaShakti

Goddess MahaKali Ma is one of another Divine and Powerful form of Goddess Durga Ma. She's the Almighty Goddess and the Shakti (the Power Consort) of the Almighty God Shiva, lays under her feet and He is the God MahaKala. She is the Divine Mother of the Whole Universe and She is the Mother Earth!
She appears as a Diamond or a black Diamond and in the form of Goddess Durga She appears as a Red Diamond. She is very Beautiful, She is very Lovely , She is the Oceaan of Love, She is very Powerful and She wants only Love and Respect from Her children and Nothing Else! She is the Slayer of Rakshas (Demons), She Protect Us from the Evil and all the Negatives and She gives also Strenght to Us! 

Shiva is the God of the Universal Law!
DurgaKali Ma is the Goddess of the Universal Law!

Goddess DurgaKali Ma and God Shiva are the MahaShakti!

God Shiva Panchaksri Mahamantra:

 OhmNamahShivay

Goddess DurgaKali Ma Mahamantra:
Ohm Aing Hring Kling Chamundaye Vichchey Namah

or

Ohm Aim Hrim Klim Chamundaye Vichchey Namah