D is for Duir, the Celtic tree of Oak. Like the mighty tree it represents, Duir is associated with strength, resilience and self-confidence. The Oak is strong and powerful, often dominating over its shorter neighbors. The Oak King rules over the summer months, and this tree was sacred to the Druids. Some scholars say the word Duir translates to "door", the root word of "Druid". The Oak is connected with spells for protection and strength, fertility, money and success, and good fortune.
In many pre-Christian societies, the Oak was often associated with the leaders of the gods -- Zeus, Thor, Jupiter, and so forth. The strength and masculinity of the Oak was honored through the worship of these gods.
During the Tudor and Elizabethan eras, Oak was valued for its stength and durability, and was commonly used in construction of homes. The bark became valuable in the tanning industry, and many areas of Scotland were deforested in the rush to harvest Oak.
Mundane Aspects: Carry an acorn in your pocket when you go to an interview or business meeting; it will be bring you good luck. If you catch a falling Oak leaf before it hits the ground, you'll stay healthy the following year. Remember that "Duir" means gate or door -- watch for chances that may pop up unexpectedly, and take what is offered to you. After all, an unknown opportunity is better than a missed one.
Magical Aspects: Be strong and steady like the Oak, no matter how unpredictable things may become for you spiritually. Your strength will help you prevail.