Direct yourself towards something or someone and try to feel love for it or him. Deep love.
Shocked, you maybe will realise that you cannot do it at all. The connection does not arise. You do not feel the oneness.
So you live in materialism. Every second of your life. And you think that this is the normal state.
Practice yogic breathing. Do a 30-minute drum or rattle trance session every day. The perception of oneness will creep in again. And then you will look and inwardly embrace – and truly love again.