Control over what one says is more important than complete silence. The best is to learn to say what is useful in the most exact and true way possible. A little bit of sincere practice is worth much more than a lot of written or spoken words.
Speak less, act more.
To be vigilant is not merely to resist what pulls you downward, but above all to be alert in order not to lose any opportunity to progress, any opportunity to overcome a weakness, to resist a temptation, any opportunity to learn something, to correct something, to master something. If you are vigilant, you can do in a few days what would otherwise take years. If you are vigilant, you change each circumstance of your life, each action, each movement into an occasion for coming nearer the goal.