No act of kindness, no matter how small, is ever wasted (Paraphrase, The Lion And The Mouse, Aesop circa 580 BC).
Try to make at least one person happy each day. If you cannot do a kind deed, speak a kind word. If you cannot speak a kind word, think a kind thought. Imagine, if you can, the treasure of happiness that you will dispense in a week. In a year. In a lifetime.