One who is happy with all the good that Hashem has bestowed upon him, is fulfilling the mitzvah of kiddush Hashem.  People will see how fortunate Torah observers are.  A frum yid who is depressed and speaks only of what is missing from his life, causes others to look down upon Torah observance.  This is the ultimate chilul Hashem.   ~ R’ Yehudah Leib Chasman zt”l (Torah Tavlin)