In the call for Unity -- Oneness is the standard. From page 161-162, God in Search of Man, Abraham Josua Hescel.
Such a standard would have to be an idea, not an event. It would have to be an ultimate idea, worthy of serving as an identification of the divine and at the same time the supreme idea in human thinking, a universal idea. Such an idea is 'oneness' or 'love', which is an expression of oneness.
All knowledge and understanding in science, art, ethics, as well as in religion, rest upon its validity. Oneness is the norm, the standard and the goal. If in the afterglow of a religious insight we can see a way to gather up our scattered lives, to unite what lies in strife -- we know it is a guidepost on His way.
If a thought generates pride, separation from other people's suffering, unawareness of the danger of evil -- we know it is a deviation from His way.
An insight is not meaningful to one man unless it is capable of becoming meaningful to all men. He who has made that which is at all times, illumines man with thoughts that ought to be valid at all times.
Only that which is good for all men is good for every man. No one is truly inspired for his own sake. He who is blessed, is a blessing for others.
There are many ways but only 'one' goal, If there is one source of all, there must be one goal for all. The yearnings are our own, but the answer is His.
Beyond all mystery is the mercy of God. It is a love, a mercy that transcends the world, its value and merit. To live by such a love, to reflect it, however humbly, is the test of religious existence.
To summarize: the power of religious truth is a moment of insight, and its content is oneness or love. Source and content may be conveyed in one word: 'transcendence'.
Transcendence is the test of religious truth. A genuine insight rends the enclosure of the heart and bestows on man the power to rise above himself.