Newton's health, and confusion to mathematics.

Do your duty, and don't swerve from it. Do that which your conscience tells you to be right, and leave the consequences to God.

Invention is totally independent of the will.

Never let your love for your profession overshadow your religious feeling. Depend on it that religion will strengthen, not weaken, your energies, and will not only make you a better sailor, but a superior man. Professional studies are not to be neglected; but, on the other hand, take care how you fall into the common error of believing they are the remedy for all the ills of life.

To procrastinate seems inherent in man, for if you do to-day that you may enjoy to-morrow it is but deferring the enjoyment; so that to be idle or industrious, vicious or virtuous, is but with a view of procrastinating the one or the other.

Never disregard what your enemies say. They may be severe, they may be prejudiced, they may be determined to see only in one direction, but still in that direction see clearly. They do not speak all the truth, but they generally speak the truth from one point of view; so far as that goes, attend to them.

Nothing is difficult; it is only we who are indolent.