...I was a different person then.

"But it's no use going back to yesterday, because I was a different person then." Lewis Carroll; Alice's Adventures in Wonderland

...realize they were the big things.

"Enjoy the little things in life, for one day you may look back and realize they were the big things." -Unknown

The past cannot be changed...

"The past cannot be changed. The future is yet in your power." -Mary Pickford

What lies behind us...

"What lies behind us is nothing compared to what lies within us and ahead of us. A journey of a thousand miles must begin with a single step." -Lao-Tzu

...and not to yield.

"... and tho' / We are not now that strength which in old days / Moved earth and heaven; that which we are, we are; / One equal temper of heroic hearts, / Made weak by time and fate, but strong in will / To strive, to seek, to find, and not to yield." -Alfred Lord Tennyson; Ulysses

Never let yesterday use up...

"Never let yesterday use up too much of today." -Will Rogers

It is because modern education...

"It is because modern education is so seldom inspired by a great hope that it so seldom achieves great results. The wish to preserve the past rather than the hope of creating the future dominates the minds of those who control the teaching of the young." -Bertrand Russell

Reflect on your... childhood...

"Reflect on your... childhood... Your sensations... your words... your emotions... Time... it will not wait... No matter... how hard you hold on. It escapes you..." -Final Fantasy VIII