Lets say I want to go to Paris. It is one thing to make the decision to go, but I need to know where Paris is and how to get there.
I cannot drive my car there from America. I will most likely have to take an airplane. I will need to know much money I need to buy the airplane tickets. How much do I need for hotel rooms, food and tours I want to take? Who will take care of my three chihuahuas while I am away? One needs knowledge.
So it is with faith and virtue. At times, despite my good intentions, I have learned that my actions were harmful more than they were helpful. Research and learning is necessary even in the world of faith (2 Peter 1:5).