All other knowledge is hurtful to him who has not honesty and good-nature.

Capability makes a person more effective at whatever they already are. Someone sharp and decent becomes more useful; someone sharp and careless becomes more dangerous, since the new skill will find the same use as everything else they have. Character is not a soft consideration alongside competence. It decides which direction the competence points.

When you are choosing who to work with or trust this week, weight decency at least as heavily as ability. In yourself, watch for places where a new skill is quietly serving an old habit. Growing more capable is only good news if the aim is sound.