A proper attribute of God is mercy. It is not difficult for God to practice mercy, on the other hand, we by ourselves cannot feel mercy unless the Lord puts such a thing in our hearts. On the other hand, there are those who lose patience very easily, but our God is not like that, He is longsuffering and abounding in goodness.
But there is something important to understand, not only mercy is an attribute of God, but also anger, but not humanly like us, but in the sense that although God is longsuffering, He also punishes whe it is required. God is all love, but He also shows His wrath on the sons of wickedness. The Bible says:
The Lord is slow to anger, and great in power, and will not at all acquit the wicked: the Lord hath his way in the whirlwind and in the storm, and the clouds are the dust of his feet.
Nahum 1:3 (KJV)
This verse is proof of this, showing attributes of God such as mercy, anger, His might and His perfect judgment on men. The verse goes on to show us a supernatural God, putting natural phenomena as fragile things before Him.
Another important point is that the Bible tells us that God judges with just judgment, but it is also important to understand that even when we are guilty, the Christ of glory saved us from our sins and we can have a new life in Him.