So shall they be life
chay (khah'-ee)
age, alive, appetite, (wild) beast, company, congregation, life(-time), live(-ly), living (creature, thing), maintenance, + merry, multitude, + (be) old, quick, raw, running, springing, troop.
unto thy soul
nephesh (neh'-fesh)
a breathing creature, i.e. animal of (abstractly) vitality; used very widely in a literal, accommodated or figurative sense (bodily or mental)
and grace
chen (khane)
graciousness, i.e. subjective (kindness, favor) or objective (beauty) -- favour, grace(-ious), pleasant, precious, (well-)favoured.
to thy neck
gargrowth (gar-gher-owth')
the throat (as used in rumination) -- neck.