So many, so many! But here is one I came across recently that hit me. From David Deida's "Blue Truth":
"Right now, and in every now-moment, you are either closing or opening. You are either stressfully waiting for something--more money, more security, affection--or you are living from your deep heart, opening as the entire moment, and giving what you most deeply desire to give, without waiting. If you are waiting for anything in order to live and love without holding back, then you suffer. Every moment is the most important moment of your life. No future time is better than now to let down your guard and love."