The heart in the spade v7
If your heart represents your self-confidence, the spade would represent your self-esteem.
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A heart is an upside down spade. Imagine a tree as a spade, grounding its roots into the soil, and at the same time rising its trunk, branches and leaves up towards the sky and beyond. The heart is pointing downwards into matter and Earth. If the heart is about experience in matter (body) the spade is about going beyond matter, into consciousness. You are both heart and spade at the same time. If your heart represents your self-confidence, the spade would represent your self-esteem.