Every noble work is bound to face problems and obstacles. It is important to check your goal and motivation thoroughly. One should be very truthful, honest, and reasonable. One's actions should be good for others, and for oneself as well. Once a positive goal is chosen, you should decide to pursue it all the way to the end. Even if it is not realized, at least there will be no regret.
It was a long and gloomy night that gathered on me, haunted by the ghosts of many hopes, of many dear remembrances, many errors, many unavailing sorrows and regrets.
A dim antagonism gathered force within him and darkened his mind as a cloud against her disloyalty: and when it passed, cloudlike, leaving his mind serene and dutiful towards her again, he was made aware dimly and without regret of a first noiseless sundering of their lives.
Fading, with the Night, the memory of a dead love, and the withered leaves of a blighted hope, and the sickly repinings and moody regrets that numb the best energies of the soul: and rising, broadening, rolling upward like a living flood, the manly resolve, and the dauntless will, and the heavenward gaze of faith-the substance of things hoped for, the evidence of things not seen!
Listen widely to remove your doubts and be careful when speaking about the rest and your mistakes will be few. See much and get rid of what is dangerous and be careful in acting on the rest and your causes for regret will be few. Speaking without fault, acting without causing regret: 'upgrading' consists in this.
It is a matter for considerable regret that Fermat, who cultivated the theory of numbers with so much success, did not leave us with the proofs of the theorems he discovered. In truth, Messrs Euler and Lagrange, who have not disdained this kind of research, have proved most of these theorems, and have even substituted extensive theories for the isolated propositions of Fermat. But there are several proofs which have resisted their efforts.
The only time you really live fully is from thirty to sixty. The young are slaves to dreams; the old servants of regrets. Only the middle-aged have all their five senses in the keeping of their wits.