We justify all our weaknesses? It is not a positive want of self-confidence; it is a lack of confidence in what the divine Grace can do for us. To justify one’s weaknesses is a kind of laziness and inertia.
Well, when one doesn’t want to make an effort to correct oneself, one says, “Oh, it is impossible, I can’t do it, I don’t have the strength, I am not made of that stuff, I don’t have the necessary qualities, I could never do it.” It is absolute laziness, it is in order to avoid the required effort. When you are asked to make progress: “Oh, it is beyond my capacity, I am a poor creature, I can do nothing!” That’s all. It is almost ill-will. It is extreme laziness, a refusal to make any effort. One accepts all one’s defects and incapacities in order not to have to make the necessary effort to overcome them. One says, “I am like that, I can’t be otherwise!” It is a refusal to let the divine Grace work in you. It is a justification of your own ill-will.
Ref: Questions and Answers 1954