It is used to tell by our Spiritual Guru that we can get quickly acquainted on any thing according to the person we got associated. If we with good people who are in the spiritual way, we dragged to a good way but is easy to get badly involved ourselves if we associated with the persons drinking or bad things.
For example, alcohol which is bad for health, people still take it, they say they do it occasionally. But if started to intake, they will slowly get a habit of it, taking it once or twice in a week, or at least once in a week. Inspite of knowing the consequence, they are attracted towards it.
We know junk food is not good for health, still we eat pizza and chips etc., this tilting pattern is in general with all human beings.
As we say good things are powerful and need to be absorbed with full dedication. To stay fit, we need to eat helthy food, so we need dedication towards a good health.
Do what inspires you !!