Oneness with work is “flow”.

Flow is the mental state of operation in which the person is fully immersed in what he or she is doing, characterized by a feeling of energized focus, full involvement, and success in the process of the activity. (source)

The act of creating something, whether it be an article, a poem, a website, a computer program, or some other creative human expression, is one of my most cherished activities. … It usually takes a while for me to fully enter the highly creative flow state, but once I’m there I lose awareness of everything but the present moment and the ideas flowing through me. (source)

Oneness with surroundings is a principle of Eastern thought.

…practitioners of Eastern religions such as Buddhism and Taoism have honed the discipline of overcoming the duality of self and object as a central feature of spiritual development. (source)

The idea of overcoming duality of self and object is a key theme of Zen and the Art of Motorcycle Maintenance: An Inquiry into Values by Robert Pirsig (1974). “When you’re not dominated by feelings of separateness from what you’re working on, then you can be said to ‘care’ about what you’re doing. That is what caring really is: ‘a feeling of identification with what one’s doing.’ (ibid.)

Oneness with people is a Christian virtue.

…be of one mind, live in peace; and the God of love and peace shall be with you. (source)

And the Lord called his people Zion, because they were of one heart and one mind… (source)

Oneness with God comes through the Atonement of Jesus

The word [Atonement] describes the setting “at one” of those who have been estranged, and denotes the reconciliation of man to God. (source)

And now Father, I pray unto thee for them … that they may believe in me, that I may be in them as thou, Father, art in me, that we may be one. (source)