The completeness of man is [achieved] through beneficial knowledge and righteous deeds.
Allah swt says:
By the time. Verily! Man is in loss . Except those who believe and do righteous good deeds, and recommend one another to the truth , and recommend one another to patience.
Here, Allah swt vows that everyone is in loss, except he who perfects his mind through iman (faith), and (perfects) his body through righteous deeds, and perfects others by calling them to the truth and being patient on it.
For truth is faith and action (combined) and they are not complete except through patience.