Why not swear? Possibly, merely as a discipline. If you can control your tongue, you can control your speech. If you can control your speech, you can control yourself. If you can control yourself, you can control the present moment. If you can control the present moment, you can control the future. If you can control the future, you can control others beyond yourself. Those who cannot control their speech will be mastered by those who can, or find themselves in a world of their making.
None of these are universals. But speech has power. I once watched an interview with a policeman who said he had received a divine gift not to swear in stressful situations, and that it helped him maintain control over those situations and the people in them and direct them toward a more peaceful end of his design. The ability to control yourself, when others can’t, even in such a small way, is a sign of maturity and developed humanity and effective power over the tides of fate.
Making Nobody Happy 