People forget your speech at the assembly. They remember whether you said hi in the hallway after.

Public moments are performances and everybody knows it, which is why they fade so quickly. The hallway is where there is nothing to gain, no audience and no reason to bother, so a small greeting carries far more information about you than twenty minutes with a microphone. Consistency in private outweighs eloquence in public every time.

Say hello to three people today who would not expect it from you. Use their names if you know them. It takes less effort than any speech and lasts considerably longer.