Concentration, itself, is nothing but a matter of control of the attention! Learn to fix your attention on a given subject, at will, for whatever length of time you choose, and you will have learned the secret passage-way to power and plenty! This is concentration!
Napoleon HillWhatever the mind of man can conceive and believe, it can achieve. Thoughts are things! Strong, deeply rooted desire is the starting point of all achievement.
Napoleon HillWhatever the mind can conceive and believe, the mind can achieve regardless of how many times you may have failed in the past or how lofty your aims and hopes may be.
Napoleon Hill