Laws of Nature, Karma, are the stringent policies in which this material creation is conducted under. For every action there is equal and corresponding reaction. All the physical and mental pleasures, all physical and mental pains that we endure during our lives, we should understand that it is no one else’s fault but our own. We can blame so many people or circumstances, but they are only the friendly deliverers of what we have ordered, either in the previous birth or earlier in this life.

Just like if you order something, pay money and when it arrives, you don’t like it! With every act, with every word in our life, we are placing an order, and then the law of Karma through various people and circumstances makes the delivery. And then we say, “God, why are you doing this to me?” But the question is why are we doing this to ourselves? A devotee of the Lord understands this truth – pleasures and pains of this world are both undesirable. What everyone is striving to achieve material and mental pleasure, for a devotee it is very undesirable.
Visit Radhanath Swami Articles