Here are some quotes related to living in the moment along with the authors:

“Do not dwell in the past, do not dream of the future, concentrate the mind on the present moment.” – Buddha
“The present moment is the only time over which we have dominion.” – Thich Nhat Hanh
“Life is available only in the present moment. If you abandon the present moment, you cannot live the moments of your daily life deeply.” – Thich Nhat Hanh
“The future belongs to those who learn from the past and live brilliantly in the present moment.” – Debasish Mridha
“Live in the present, launch yourself on every wave, find eternity in each moment.” – Henry David Thoreau
“At some point you just have to let go of what you thought should happen and live in what is happening.” – Unknown
“Wherever you are, be all there.” – Jim Elliot
“If you miss the present moment, you miss your appointment with life.” – Thich Nhat Hanh
“The moment is not found by seeking it, but by ceasing to escape from it.” – James Pierce
“Whatever the present moment contains, accept it as if you had chosen it. Always work with it, not against it.” – Eckhart Tolle
“A happy man is too satisfied with the present to dwell too much on the future.” – Albert Einstein
“The present is the point at which time touches eternity.” – C.S. Lewis
“Take a deep breath. Get present in the moment and ask yourself what is important this very second.” – Greg McKeown
“Sit just to enjoy your sitting; you don’t need to attain any goal. Each moment of sitting meditation brings you back to life.” – Thich Nhat Hanh
“The future is being made out of the present, so the best way to take care of the future is to take care of the present moment.” – Thich Nhat Hanh