Problems or successes, they all are the results of our own actions. Karma. The philosophy of action is that no one else is the giver of peace or happiness. One's own karma, one's own actions are responsible to come to bring either happiness or success or whatever.

This quote is saying that whatever we have in life, whether it be successes or challenges, is a direct result of what we have done. Our actions are what determine our outcome, which is the basis of the philosophy of karma. No one else is responsible for bringing us peace or happiness—it is only through our own actions that we can experience these feelings.