We should not look back ...

We should not look back unless it is to derive useful lessons from past errors, and for the purpose of profiting by dearly bought experience.
We should not look back unless it is to derive useful lessons from past errors, and for the purpose of profiting by dearly bought experience.

More phrases

If one does not know to which port one is sailing, no wind is favorable.
What a distressing contrast there is between the radiant intelligence of the child and the feeble mentality of the average adult.
We are masters of the unsaid words, but slaves of those we let slip out.
I have always found that mercy bears richer fruits than strict justice.
A lie gets halfway around the world before the truth has a chance to get its pants on.

Quotes from the same author

True friendship is a plant of slow growth, and must undergo and withstand the shocks of adversity, before it is entitled to the appellation.
Be courteous to all, but intimate with few, and let those few be well tried before you give them your confidence.
It is far better to be alone, than to be in bad company.
To be prepared for war is one of the most effective means of preserving peace.
Among many other weighty objections to the Measure, it has been suggested, that it has a tendency to introduce religious disputes into the Army, which above all things should be avoided, and in many instances would compel men to a mode of Worship which they do not profess.