White is associated with purity because the entire spectrum is functioning in unity. White is a healing color. White is appropriate for weddings because the unity of male and female symbolizes the unity of allness.
Learn from your past and shut the door behind to live in present. Our past is just like a dry rose which was once a rose with all colors of life, with sweet fragrance, with soft petal, with thorns but now it is left with only thorns which could still hurt.