A Tzadik is born, not made; chosen by Hashem, so why should we try?
Rabbi Yisroel Fried explains the Alter Rebbe's exhortation to the Benoni, to work to be a Tzaddik, when it will never happen. The value is in the effort, just as the native born Tzaddik must still put in the work to reach his predestined level of Tzaddik.
