A teacher, role model and example. Also someone that helps you achieve your goals.
From Merriam Webster-Online: A trusted counselor and guide.
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A mentor is someone who comes alongside you to help you through situations you haven't dealt with before, but the mentor has, or has some knowledge in how to overcome the situation.
It was the priest in the temple called Eli.
Thomas Wentworth Higginson
It's Simon Cowell. :)
* any of various plants of the genus Salvia * a mentor in spiritual and philosophical topics who is renowned for profound wisdom