Be Truthful and spread happiness
Being Truthful is a great quality which is only difficult during the initial phase. But once you practice it , it becomes a very contagious infection on everybody around you. Being truthful first helps you in having nothing in your mind, and therefore you will never face any blood pressure or stress.
Also, by being truthful you will be able to spread happiness to everybody around you.
Very rarely you may put somebody in trouble by speaking the truth, but that should not deter you from continuing with the great quality.