Knowing the context in which these statements were made would be very helpful.
1.The first statement, as it stands, is partly true and partly false.
Lots of things can make a person feel happy.
But since things in the "outer world" are composites, they are thus temporary,
as is our relationship to them.
So, any happiness they bring will also be temporary.
2.There are problems that arise in one's life
but when one has a correct view of things,
the fact that problems come and go
is not a problem.
3. Ultimately, we have no (or very little) control over events that occur.
The only thing we really have control over is the mind,
and how we respond to those events.
A metaphor often given is this:
The world is full of sharp rocks. (everywhere you go there are difficulties)
You cannot cover the whole earth with leather,
but you can cover your feet with leather (wear shoes)
and achieve the same effect.
So, instead of trying to change everything that you find unpleasant,
work with your own mind.
Yes, it is possible to control one's mind to such an extent that you do not feel pain
Everybody cannot do this to the same degree, and it takes some practice.
For example, with some training, one can visualize that the pain they feel
is the suffering of all beings, and that they are taking that suffering upon themselves.
You would think this would only make the pain worse,
but in fact, just the opposite.
Profile Picture: "The Foaming Monk"
The Chinese characters are Fo (buddha) and Ming (bright). The image is of a student of Buddhism, who, imagining himself to be a monk, and not understanding the true meaning of the words takes the sound of the words literally. Likewise, People on web forums sometime seem to be foaming at the mouth. Original painting by P.Volker /used by permission.