But now they are hidden from your eyes.

Luke19:42
If you had known ... in this your day, the things that make for your peace! But now they are hidden from your eyes.

There are things that God reveals to us, and there are things that God conceals from us. Those whom He regards as friends, He will reveal things too. To be considered His friend, depends on our walk with Him. As His children living in this sinful world, we are tempted by various things and falling for those temptations brings us further from God than before. That is why sometimes we fail to see the things God wants to reveal to us. Our hearts may become hardened as we are in denial or preoccupied with whatever sins we are involved in. However, it is not too late to remember that there is no condemnation in Christ Yshua and go back in repentance to Him.