Adar״ Increase Happiness 30 Days Day 25 Rabbi Yitzchok Minkowicz — ‎משנכנס אדר מרבים בשמחה יום כה‎ “

31 and says in reference to kadusha Holiness it's strength and joy and happiness and the author goes on to say the shrina Hashem only rests on somebody when you're in the state of simcha and he brings from that reason that let's say someone's concerned about some sins so dedicate time to do that but when you learn and when you pray and when you're going about your activities it's important to be always the simha with a sense of happiness