सद

In a sentence

• सद विचार हमेशा उन्नति की ओर ले जाते हैं।

  Noble thoughts always lead to progress.

  In this sentence, 'सद' functions as a prefix indicating good or noble qualities associated with 'विचार' (thoughts).

• सदाचारी लोग समाज के आधार होते हैं।

  Virtuous people are the foundation of society.

  Here, 'सदाचारी' denotes someone who adheres to moral or ethical conduct, with 'सद' imbuing a positive moral quality.

• सद्भावना ही समाज में शांति लाती है।

  Goodwill brings peace to society.

  In this case, 'सद्भावना' combines 'सद' with 'भावना' (feelings), conveying the idea of positive or good feelings.