Concentration

It is those who concentrates on but one thing at a time who advance in this
world. The great man or woman is the one who never steps outside his or her
specialty or foolishly dissipates his or her individuality.

The weakest living creature, by concentrating his powers on a single object, can accomplish good results while the strongest, by dispersing his effort over many chores, may fail to accomplish anything. Drops of water, by continually falling, hone their passage through the hardest of rocks but the hasty torrent rushes over it with hideous uproar and leaves no trace behind.
Mandino, Og
1923-1996 American Motivational Author Speaker

Give whatever you are doing and whoever you are the gift of your attention.
Rohn, Jim
American Businessman Author Speaker Philosopher

Put your heart, mind, intellect and soul even to your smallest acts. This is the secret of success.
Sivananda, Sri Swami
1887 Indian Physician Sage

If you chase two rabbits, both will escape.
Unknown, Source

The ability to concentrate and to use time well is everything.
Iacocca, Lee
1924 American Businessman Former CEO of Chrysler