Luke 3 - 4

Now when the devil had ended every temptation, he departed from Him until an opportune time. (Luke 4:13)

Until an opportune time. When will that be?
You won't know. And neither would I.

For the devil walks about like a roaring lion, seeking whom he may devour. (1 Peter 5:8)

Which is why the Psalmist David prayed that God cleanse him of his secret faults (Psalm 19:12), sins which he probably did not even know he had committed.

So that he may be blameless before God.
So that the devil will not have a foothold on him, to stumble him.

Look at the verse again. When the devil had ended every temptation.

The devil will not stop until he had tried ways and means to make us fall. He is out to destroy us. This is the sole purpose he is here for and so he must be really good at it! Let's not underestimate him!

And he does not stop there. After trying ways and means to trip us, if he is unsuccessful, yes, he will leave..... but only until an opportune time, .... when he can come and stumble us again.

He will never stop trying to pull us into hell with him. So never think that we are strong, lest we fall (1 Corinthians 10:12)!

We can only rely on the mercy of God to bring us out of every trial unto eternal life (Jude 21).