Years wrinkle the face but to give up enthusiasm wrinkles the soul.
Success is working with enthusiasm and ambition, living with joy and kindness, and going toward a life of ultimate service and happiness.
I never think of him as a scholar assaulting me with how much he knows, but as a teacher eager to share a lifelong passion for the subject.
Teddy Roosevelt "had relished "every hour" of every day as president. Indeed, (he was) fearing the "dull thud" he would experience upon returning to private life.
Your youth is certainly finished and old age has definitely arrived if you feel that you are losing enthusiasm, excitement and energy towards your dreams and goals.
Nevertheless, scientific method is not the same as the scientific spirit. The scientific spirit does not rest content with applying that which is already known, but is a restless spirit, ever pressing...
Entrepreneurs don't have weekends or birthdays or holidays. Every day is my weekend, my birthday, my holiday. OR, every day is my work day. Mostly it's a choice.
The volume of your impacts is measured by the direction of your movements, the passion with which you inspire and the attitudes by which you make an influence!
You can not have empty or neutral mind, as long as you work the mind will contain dreams, if you stop working it will contain regrets.
Enthusiasm is the most beautiful word on earth.
I would not be among you to-night (being awarded the 1964 Nobel Prize in Physiology or Medicine) but for the mentors, colleagues and students who have guided and aided me throughout my scientific life...