
There are many famous old Oak trees. The most notable perhaps is the major Oak in Sherwood Forest, although it is a big disappointment to see it these days, held up with chains and a fence round it to stop all human contact. Other ancient Oaks can be found on village greens or in fields and would previously have been used a boundary marker. Many old Oaks were called Gospel Oaks, relating to the time when the gospels were preached from beneath their mighty shade. Of course, this follows on from the custom and practice of the Druids who met in mighty Oak groves and beneath old Oak trees, for all their meetings and teachings were outside in the open and closely connected to the tree dryads.
One etymology of the word Druid derives it from "dru-wid", meaning "knower of oak trees", but "deru" also means truth or troth and so could also give the meaning "knower of the truth".
In the Ogham, the Oak is given the word Duir. Duir comes from the Gaelic and Sanskrit word meaning "door" and there are many associations to be found linking the oak, not only to the doors of our houses but also as representing a doorway to inner strength and inner spirituality. The Oak will lead the way to the truth, especially where this is connected to part actions and this revelation will bring strength and vision, and a doorway to new understanding.
Sometimes the road for Oak in the Beith-Luis-Nion is given as Dair instead of Duir. The word dair describes a rutting deer and kingship, connected the Oak and the Oak king to the Beltane rites. It is also closely connected to the Daghdha who is linked to the Earth and the physical attributes of food, sex and crude raw physical energy, also uppermost at Beltane.
In the Beith-Luis-Nion system as described by Robert Graves the Oak, being the 7th tree, is central to the 13 moons and is linked to the Summer Solstice. "The lunar month which takes its name from Jupiter, the Oak-god, begins on 10th June and ends on 7th July. Midway comes St John's Day, 24th June, the day on which the Oak King was sacrificially burned alive. The Celtic year was divided into 2 halves, with the second half beginning in July, apparently after a 7-day wake, or funeral feast, in the Oak King's honour."
Traditionally, the need fire (a sacred fire which was kindled after all the other fires had been put out) was always kindled in an Oak log, and the fuel for the Midsummer fires was customarily of Oak. The Oak therefore virtually stands at the doorway of the great turning point of the year, the Summer Solstice. The sun reaches the height of its power and strength, and turns to begin a new cycle of its decline. The Oak is central to the understanding that this change will effect us, and is part of our growth which links us to the etheric web of the Earth. The Summer Solstice is the peak of expressive and expansive personal energy, but it cannot last forever, or we would burn ourselves out. Strength and endurance can be gained if we learn from our experiences now, and begin to prepare for the new cycle which is about to begin.
Source: whitedragon.org