To reaching to enlightenment or other words to know your own trueself.
Biggest enemy or barrier we have to get there it is mind.
One of the most useful meditation is Buddhist meditation. By doing that many people reaching to stop their mind, but still they didn’t reach to themselves.
Truth is when your mind stop, everything you know is stop, your sense of doing is stop, and usually trueself is rotated or it is in sleep. Who is mind is stop has no ability to waken his own trueself.
Because of that one person needs helps of other who already waken and passed through.