These are the three steps of truth. We climb to the first by the toil of humility, to the second by the deep feelings of compassion, and to the third by the ecstasy of contemplation. On the first step we experience the severity of truth, on the second its tenderness, on the third its purity. Reason brings us to the first as we judge ourselves; compassion brings us to the second when we have mercy on others; on the third the purity of truth sweeps us up to the sight of things invisible.
~ from BERNARD OF CLAIRVAUX ed. by M. Basil Pennington
A powerful meditation when contemplating the oneness of everything is to find something's unique qualities. For example, observing an island's wholeness and then focusing upon the uniqueness of a single stone. . . . this meditation is simple but powerful. . . . Other examples to meditate upon (other than an individual stone on the island beach) are faces in a crowd or a leaf on a tree. Each person (in the crowd) is unique and yet (at that very moment) part of the whole. The same is true for leaves on the trees. Practicing this deceptively easy meditation helps each of us to see reality.