Some of the Samaritans believed Jesus was the Christ just on the strength of the womans testomony.

Some other Samaritans had to go and see for themselves before they concluded that Jesus was the Christ. 

Some people accept Jesus just because of anothers testomony about him. Some people have look for themselves before they believe in him.

Every week your wife buys a lottery ticket, one week she wins and comes to you exclaiming that "We've won the lottery!" you may believe her instantly or you may have to check the ticket yourself, either way you have won the lottery (provided you cash in the ticket)

I think that anyone who listens to Jesus' word with an open mind will understand that he is the Savior of the world.