The lack of moral strength can be the result of the lack of a father figure in education. There may be the lack of a personal relationship with God which permits the overcoming of difficulties when we've failed, and by which we can let him pick us up and return to him and the moral standards. The lack may be caused by the failure to express the assertive emotions. In such cases, the judgment of conscience may be true, but very little will flow out of it. The divine image is manifested in the charity of the Christian and perfected by his free choice in accord with the truth we perceive.
Conscience has to be formed.
It must be formed so that it will be in accord with the objective truth of reality. The next step is that conscience must be certain, capable of influencing decision making. We must both be able to perceive the values and make choices with confidence and certainty. Some people fail to have confidence in the judgment of conscience, and always hesitate, which is a sign of immaturity. Traditional moral theology worked out several principles to aid the conscience in doubtful cases.