The concept of applying is related to the joint and the connection. Joint is the point of contact between two or more things and allows coexistence and cooperation. In our modern life, all the objects we use are characterized by the utilization of this technique, the assembly, the adaptation and the application in our everyday life.
If there is a theory, its application proves its correctness and operational value. Until then, there is a theory of no practical value for the everyday person. Christ has recommended the same logic to you and me; to put into practice – in a functional and productive combination – the elements of his teaching and not just listen to them.
The eagerness and cost of foolish virgins in the parable where they went to obtain the oil in the night proves that the judgment of God is not emotional but is based on numbers and results practically. The cost of the fool’s house built on the sand and did not make the building safe, was that it fell down precisely because he had not applied the common sense of things.
And to apply something, I have to know it, to have tried it and experimented with it personally so I know the result safely. Responsibility is always a personal matter and is not transferred to third parties.