In a craft, lying about inability is just as detrimental as lying about greatness. Honest self-evaluation in any pursuit is a key to growth. It is also a learning tool that takes time to develop and must constantly be sharpened, like a knife upon a whetstone. An untrained hand can still peel a rind back with the glinting edge of a small blade; just as the nascent singer can begin to identify how close their voice matches a note struck by a well-tuned piano. Many times truth is in the unmasking. The more brush cut away, the more a path can be revealed.
Truthful self-evaluation enables a person to see how far they have come, by acknowledging the past that is behind them. It allows them to see where they are headed, by acknowledging how much farther they have to go. Devoid of it a person can no longer strip away the vines that obscure who they are in a set point in time. The distorted view has repercussions. If the nascent singer cannot accept that they are in tune, how can they prepare for an aria? How can a brilliant, but unconfident performer convince an audience to see them on stage? How can a virtuoso improve, when their hubris makes them believe that there is nothing left to learn? Truth will assist you, if you let it. If strengthened through practice, its unwavering nature will fortify and guide you.