Spiritual teachings often say something akin to ‘We are all one’. This is usually just a nice spiritual concept that nobody really understands. And if we do try to study it, It is not something we can use our mind to fathom, as the knowing of oneness is not an intellectual process.
We have to have a direct experience of oneness to have some inkling of it, and even then it is still a mystery.
Love however is a direct door into oneness. It is the connecting force of all life. It is the energy of consciousness being alive and close and connected with itself. It is the direct recognition of ones self in the ‘other’, where self and other dissolve.