It is about making the person decide that he wants to do it by himself. This is the beauty of it.
Assumptions come in quite handy for the purposes of persuasion. I should point out that it is the task of the practitioner to make the person assume something and use it to his advantage. This technique should not be mistaken with the techniques involving presuppositions.
How do you make people assume something, then? Those who know how to mind control actually use statements and other simple language forms. It is all about how you say things.
One great technique for making people assume things is to make general statements that are as little specific as possible. It is just like using deletions.
For instance, you can say, “Most successful people are good speakers.” What does this statement mean? It means that in order to be successful, you have to be a good speaker. From then on, you can readily persuade the person to take classes in public speaking.
Another technique which those who know how to mind control use a lot involves exploiting the different meanings of words. You can readily say, “I feel like eating a fine chocolate bar, but I cannot afford it.”
You may mean that you are on a diet and you cannot allow yourself to eat chocolate. However, it is easy for a person to assume that you do not have money to afford it. In turn, you can get yourself a free bar of fine chocolate.
These are just simple examples, but you can see how not using a vague phrase, possibly with dual meaning, can give you what you want.