Chance fights ever on the side of the prudent. – Euripides

We can easily become as much slaves to precaution as we can to fear. Although we can never rivet our fortune so tight as to make it impregnible, we may by our excessive prudence squeeze out of the life that we are guarding so anxiously all the adventurous quality that makes it worth living. – Randolph Silliman Bourne

All enterprises that are entered into with indiscreet zeal may be pursued with great vigor at first, but are sure to collapse in the end. – Tacitus

It is no less a feat to keep what you have, than to increase it. In one there is chance, the other will be a work of art. – Ovid