If the mind wants to comprehend reality, it will have to come out of the past and the future. But coming out of the past and the future, it is no longer the mind at all. Hence the insistence of all the great masters of the world that the door to reality is no-mind.
The present gives you the opportunity to dive deep into the water of life, or to fly high into the sky of life. But on both the sides there are dangers - 'past' and 'future' are the most dangerous words in human language.
Zen lives in the present. The Whole teaching is: how to be in the present; how to get out of the past which is no more and how not to get involved in the future which is not yet, and just to be rooted, centered, in that which is.
When ambition enters, creativity disappears - because an ambitious man cannot be creative, because an ambitious man cannot love any activity for its own sake. While he is painting he is looking ahead; he is thinking, 'When am I going to get a Nobel Prize?' When he is writing a novel, he is looking ahead. He is always in the future - and a creative person is always in the present.
Either you are drowned in the past or you are drowned in the future. That's why you are not. That's why you yourself have become a falsehood. You are too concerned with the false, and that concern makes you pseudo. Withdraw yourself from the past and the future. Love is always an emperor.