In forming your plan for your future you need to distinguish three different questions: What is possible? What is likely to happen? What is desirable to have happen? In a sense the first is Science... The second is Engineering.. The third is ethics, morals, or... value judgements.... you will probably have an idea of how to alter things to make the more desirable future occur... having a vision is what tends to separate the leaders from the followers.

The Art of Doing Science and Engineering: Learning to Learn (1991)