The God we meet in Scripture is a relentlessly patient God.
He usually accomplishes his plans along the winding path. He fulfils his promises without haste.
He compares his kingdom to a mustard seed.
The greatest displays of God’s patience appear in response to our sin.
“God is patient” means not mainly that God waits a long time,
   but that God shows longsuffering kindness to sinners. 
As God declares to Moses on Mount Sinai, he is not “slow,” but “slow to anger”.

Romans 2:1-4 NLT
You may think you can condemn such people, but you are just as bad, and you have no excuse! When you say they are wicked and should be punished, you are condemning yourself, for you who judge others do these very same things. And we know that God, in his justice, will punish anyone who does such things. Since you judge others for doing these things, why do you think you can avoid God’s judgment when you do the same things? Don’t you see how wonderfully kind, tolerant, and patient God is with you? Does this mean nothing to you? Can’t you see that his kindness is intended to turn you from your sin?

In Jesus, as PATIENCE incarnate he took the lashes, the thorns, the nails,
   allowing his creatures to mock him with the breath he gave, all the while pleading for their forgiveness.

Luke 23:34A NLT
Jesus said, Father, forgive them, for they don’t know what they are doing.

These notes are from Scott Hubbard on the Desiring God website