This illustration shows how you can achieve desired goal by making that choice Weigh the most. 
It is showing the principal of the Weighing-Scale-Method, which states that:

All choices in all situations can always be posted in a weighing-scale-setup. Where the decision that will be made is the choice that weighs the most!

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We basically take advantage of this mindset and try to make whatever outcome we want to happen weigh the most. This can be used to influence yourself or other people.