Vishnu sahasranamam, slok108:

Slok108:       VanamAlee GaDee SAramgee Samkhee Chakree cha NamDakee
                      SreemannaryaNo Vishnuhu VAsuDevobhi Rakshathu

JeevanamAlee, the Devine Celestial Radiation with innumerable colours and hues, the Celestial Pivotal Evergy in a form Conch, and the Pivot of Bliss, is SreemannarayaNa called as VISHNU in Thrilokas and VasuDeva of human world, who saves or takes care of everything.  

The first line of the verse is criptic and abbreviated form.

Vanamaali is JEEVANAMALI, which means the  Source of“LIFE FORCE”

GaDee = Ga+Dee= Ga means Gaganam, Dee means DEEPTHI. Means “ The LIGHT OF THE SKYS

Sahara gee = A Composite of Multiple Colours

Samkee=  KEE Means Keelakam., Sam means Skys. So, SAMKEE means, The PIVATAL POINT of Skys

CHAKREE=  The REVOLVING  POWER WHEEl, I.e called, “SUDARSHANA CHAKRA”

NAMDAKEE = ANAMDAKEE means The SOURCE of BLISS

This slok is the" Capsule of the Secret of Divinity." The Devine is Single, "Single unity."

The "Devine Supreme Consciousness" existing in all lokas is "NarayaNa".
The Lord of Thri lokas is "VISHNU".
The Lord of living beings is "VASUDEVA".
The secret is that the structural formula of three devine entities is the same, but the functional formula differs according to the zone of action.
It is only one "Supreme Consciousness or say " Supreme Self" everywhere.
Before you, Behind you, Besides you, Inside you and far far away too, it is only one single Devine entity. Only one Invisible, comprehensive of all energies, all powers, and all potentialities.

" Om Namo NarAyaNAya" is NArAyaNa mantra.
"Om Vishnave  Namaha" is Sree Maha Vishnu mantra.
" Om Bhagavathe VAsudevAya Namaha" is Vasudeva mantra.

All three mantras lead anybody, towards the same Almighty-Paramatma only,
when chanted with absolute devotion and concentration.  

ParamAthma is the Celestial Brillience with Golden Glow consisting innumerable  colors and hues. PARAMATMA is Light of Devine Brightness and  Vitality. " ".Thejo Vrusho DyuthiDharaha ".  Gaurds and Rescues everything,holding  many weapons.
(" SarvasasthrabhruthAm varaha"). This Slok essence is already once refered in 81st slok.

The NarayaNa, Vishnu, and VAsuDeva are all one and the same who take care of our welfare.  Their Stature is different but Structure is the same.  

The Atma and Paramatma,are one and the same." THAT" is "JeevanamAli." 

                Om Vishnave namaha