Serve Hashem with happiness

This morning, I received the following image in an email with the caption "A smile from heaven."
Let's give G-d a reason to smile on us.
Yesterday, I listened to a lecture by Rabbi Z. Wallerstein about the art of giving. He said that marriage is not about give and take, but rather about give and give.
He then went on to speak about our relationship with G-d. During Shemoneh Esrei, we normally beseech Hashem with all sorts of requests for financial security, good health and the like. The rabbi suggested that we take the opportunity to give back to Hashem. We can try to bring about a kiddush Hashem as a method to give back to G-d and repay all the kindness bestowed upon us.