Answer:
I agree with him
Explanation:
As all teachers (should) know, we are very likely to learn more about ourselves while helping others. To give an example: as a percussion teacher I am sometimes confronted by an eager student who wants to know specific details on a rhythm which I cannot provide instantly. This very often leads me to realize my own imperfectness.
However, Gandhi goes a little further - normal for a person shaped by Oriental Philosophy - and delves into the soul (or religious/spiritual centre) of men with this quote.
Here is another quote that summons up quite well what Gandhi was referring at: The individual cannot love
D.H. Lawrence