Why God sometimes is not answering our prayers

We need to cleanse our hands and to come to Him, Jesus with a heart that is fully dedicated to Him.
If we harbor in our heart, hiden sins, if we do not have a heart, mind and soul that is fully commited to God, our prayers wil not be listened and answered!
To be a christian is a very serious deal.Sadly, many are taking this aspect, that is the most important aspect of our life, easily and even in joke!
Let's truly honor Jesus and have a heart for Him and then for sure, our prayers wil be answered!
God bless you all and as a Bible verse

Isaiah 59:2

But your iniquities have built barriers between you and your God, and your sins have hidden His face from you, so that He does not hear.