If you said to yourself, my children, “We want to be as perfect instruments as possible to express the divine Will in the world”, then for this instrument to be perfect, it must be cultivated, educated, trained. It must not be left like a shapeless piece of stone. When you want to build with a stone you chisel it; when you want to make a formless block into a beautiful diamond, you chisel it. Well, it is the same thing. When with your brain and body you want to make a beautiful instrument for the Divine, you must cultivate it, sharpen it, refine it, complete what is missing, perfect what is there.
Ref: Questions and Answers 1953