The number 1 is said to represent the Universe, singularity, individual identity, and independence.

The spell casting or works that go well with this number correspondence are accomplishment, action, ambition, assertiveness, beginnings, business, courage, creativity, determination, harmony, healing, independence, inspiration, leadership, light, luck, money, optimism, order, organization, peace, power, self-work, will power. 

*Some of this information was taken from Llewellyn’s complete book of correspondences by Sandra Kynes*

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