Strength, perseverance, mightiness, sheltering, protection, hardiness, fruitfulness. Continuance in the face of difficulties, or facing of hardship. This has probably arisen from some of the harsh climates oaks grow in, like on rocky sea cliffs. Many people translate or understand the cross of Jesus to be a tree. Artists have sometimes depicted Jesus nailed to a tree. Often, this is the oak, which symbolises the power of physical life, the power behind material creation. See: Acorn, Cross, tree.