Recognize that they have done so because they care about you. Being a mentor is a choice, and they made the choice because they wanted to help you. Who are they? Those who have impacted your growth and development; those who have had an effect on the way you think; those that inspire you personally or professionally; and especially those that have motivated you to be a leader in your own right. Take the time to thank these folks and let them know how much you appreciate them. Let them know that you are different because of them – that they have made a difference. Since there is rarely instant gratification in mentoring others, there is nothing more satisfying to a mentor than knowing that they actually made a difference. They will be proud. Let’s let them know!
Oh, and do it today so it is not lost in the pile of all your other leadership duties.
Devoted to Leadership 
I enjoy seeing others grow, mature and improve their working skills.