You catch more flies with honey than with vinegar

प्रियवाक्यप्रदानेन
सर्वे तुष्यन्ति जन्तवः ।
तस्मात्तदेव वक्तव्यम्
वचने का दरिद्रता ॥

- चाणक्यनीतिः

Sweet words bring pleasure to everyone. So, one should use only pleasing words as there is no scarcity of such words.

Speech is a mirror of the soul; as a man speaks, so he is.
Always keep your words soft and sweet, just in case you have to eat them.
You catch more flies with honey than with vinegar.