The following message or quote does an excellent job of describing the importance of sincerity in ones actions and lifestyle. It needs no further comments from me.
It is the depth of thought that is powerful, and sincerity of feeling which creates atmosphere.
Bowl of Saki, November 30, by Hazrat Inayat Khan
Commentary by Pir-o-Murshid Inayat Khan:
Very few realize what power sincerity carries. A false man, however physically strong he is or however great is his will power, is kept down by his falsehood; it never allows him to rise. It eats into him because it is rust. Those who have done great things in life, in whatever walk of life it be, have done them by the power of truth, the power of sincerity, of earnestness, of conviction; when that is lacking, power is lacking.
The more sincerity is developed, the greater share of truth you will have. And however much sincerity a person may have, there is always a gap to fill, for we live in the midst of falsehood, and we are always apt to be carried away by this world of falsehood. Therefore we must never think we are sincere enough, and we must always be on our guard against influences which may carry us away from that sincerity which is the bridge between ourselves and our ideal. No study, no meditation is more helpful than sincerity itself.
We must come to the realization of the one life running through all. To a certain degree we attain to the realization of unity by contemplation, religion, and prayer. But what is most necessary is sincerity in our way of life. What we are is all that really matters. Contemplation and meditation help in this, but our manner of life is what is all important, sincerity in our actions, and living life practically and not in theory.
~~~ It is the depth of thought that is powerful, and sincerity of feeling which creates atmosphere.