In the wake of the overwhelming effort to pay tribute to former South African President Nelson Mandela, it appears to me that people miss the most important attribute of truly great leaders.
Great leaders redirect credit and praise from themselves and suggest that it be directed toward the creator of this world. The Bible specifically teaches that all people are sinners and have fallen short of the glory of God, even the best of mankind. That is not to say we should not acknowledge the good that men do, but keeping it in perspective adds to the validity of the praise. To God be the glory; not mankind.