青春不是人生的一個時期，而是一種心態。
青春的本質不是粉面桃腮，不是朱脣紅顏，也不是靈活的關節，而是堅定 的意志 ，豐富的想象，飽滿的情緒，也是盪漾在生命甘泉中的一絲清涼。
青春的內涵，是戰勝怯懦的勇氣，是敢於冒險的精神，而不是好逸惡勞。許多 60歲的人反比20歲的人更具上述品質。年歲雖增並未衰老；衰老的成因，是放棄了對理想的追求。 歲月褶皺肌膚，暮氣卻能褶皺靈魂。煩惱、恐懼，乃至自疑，均可摧垮精神，傷害元氣。 人人心中都有一部無線電臺。只要能從他人和造物主那裏收到美好、希望、歡暢、勇敢和力量的信息，我們便擁有青春。 一旦天線坍塌，精神便會遭到憤世和悲觀的冰霜鎮壓。此時，即使20歲的 人也會覺得老了；然而，只要高豎天線，不斷接收樂觀向上的電波，那麼，即使你年過80歲，也覺得年輕。
Youth is not a time of life; it is a state of mind. It is not a matter of rosy cheeks, red lips and supple knees. It is a matter of the will, a quality of the imagination, vigor of the emotions; it is the freshness of the deep spring of life.
Youth means a temperamental predominance of courage over timidity, of the appetite for adventure over the love of ease. This often exits in a man of 60, more than a boy of 20.nobody grows merely by the number of years; we grow old by deserting our ideas. Years may wrinkle the skin, but to give up enthusiasm wrinkles the soul. Worry, fear, self-distrust1 bows the heart and turns the spirit back to dust.
Whether 60 or 16, there is in every human being’s heart the lure of wonders, the unfailing childlike appetite of what’s next and the joy of the game of living. In the center of your heart and my heart there is a wireless station; so long as it receives messages of beauty, hope, cheer, courage and power from men and from infinite, so long as you are young.
When the aerials are down, and your spirit is covered with the snows of cynicism and the ice of pessimism, then you’ve grown old, even at 20, but as long as your aerials are up, to catch waves of optimism9, there’s hope you may die young at 80.