Far more numerous are those as such who think to little and talk to much. John Dryden
Think to yourself that every day is your last; the hour to which you do not look forward will come as a welcome surprise. Horace
We should listen to the voice of conscience. It does not take nearly as much courage as one might think to admit to our mistakes and learn from them. Human beings are in this world to learn and to change themselves in learning. Traudl Junge
The orators - and the despots - have the least power in their cities ... since they do nothing that they wish to do, practically speaking, though they do whatever they think to be best. Plato
You learn to speak by speaking, to study by studying, to run by running, to work by working; and just so you learn to love God and man by loving. All those who think to learn in any other way deceive themselves. Francis de Sales
Don't think to hunt two hares with one hound. English Proverb