The difficulty you find results very much from your always worrying with your mind about things, thinking “This is wrong, that is wrong in me or my work” and, as a result, “I am incompetent, I am bad, nothing can be done with me.” Your embroidery work, your lampshades etc. have always been very good, and yet you are always thinking “This is bad work, that is wrong” and by doing so, confuse yourself and get into a muddle. Naturally, you make a mistake now and then, but more when you worry like that than when you do things simply and confidently.
It is better whether with work or with sadhana to go on quietly, allowing the Force to act and doing your best to let it work rightly, but without this self – tormenting and constant restless questioning at every point. Whatever defects there are would go much sooner, if you did not harp on them too much; for by dwelling on them so much you lose confidence in yourself and in your power of openness to the Force – which is there all the same – and put unnecessary difficulties in the way of its working.
Ref: Letters on Yoga Vol. II