Learn from past, plan the future but live in present

If I was asked to describe philosophy of my life in one line, then it would have been the heading of this post. However, I donot believe in saying things in one line as they can be interpreted in different ways by different people. A philosophy, which is the teaching of all great philosophers including Bhagwad Gita, i.e. "to perform your duties without caring about the results" may also be derived from the headline of this post.
To understand the meaning of this headline, we would like to understand the meaning of word "live". So living in present means to be affected only by the present environmental conditions. Not to be worried about the future and not to repent on past mistakes. Living in present means to work in present not caring about adversities of future or mistakes of past. This heading can be also supposed to indicate to towards "Learn as if you were to live forever, live as if you were to die tommorrow."
Suppose you are targetting an examination, say CAT. Though you learn from past mistake that one should study very hard, one should do many sample papers and one should not waste time, but you don't let yourself down by thinking that I have started preparation very late or your english has been very poor since very begining. You plan the future, in this case you plan your time ahead for preparation, you give some time for verbal ability, some time for quantative ability but you don't worry about the limited seats available, high fees structure, "what if CAT pattern changes?"
In pursuit of your dreams, never think that I will live my life in future, because tommorrow never comes. Even when you are chasing your dreams, try to live your life to the fullest.
Sometimes we make unforgivable mistakes, which change our lives negatively. Never repent on past mistakes or decisions. Think "what to do now, so that conditions can be improved." This is what to live in present means.