ANSWER (from WikiAnswers):
I Corinthians 10:13
No temptation has seized you except what is common to man. And God is faithful; he will not let you be tempted beyond what you can bear. But when you are tempted, he will also provide a way out so that you can stand up under it.
Here are some other really good ones.
Thou wilt keep him in perfect peace, whose mind is stayed on thee: because he trusteth in thee.
Who shall separate us from the love of Christ? shall tribulation, or distress, or persecution, or famine, or nakedness, or peril, or sword?
As it is written, For thy sake we are killed all the day long; we are accounted as sheep for the slaughter.
Nay, in all these things we are more than conquerors through him that loved us.
For I am persuaded, that neither death, nor life, nor angels, nor principalities, nor powers, nor things present, nor things to come,
Nor height, nor depth, nor any other creature, shall be able to separate us from the love of God, which is in Christ Jesus our Lord.
I John 4:4
Ye are of God, little children, and have overcome them: because greater is he that is in you, than he that is in the world.
What shall we then say to these things? If God be for us, who can be against us?
A LITTLE FURTHER
The scripture previously mentioned at 1 Corinthians 10:13 highlights that God will not allow a Christian to be tempted beyond what he can bear, but it does not say that he is the source of the temptation or trial. James 1:13 says, "When under trial, let no one say: "I am being tried by God." For with evil things God cannot be tried nor does he himself try anyone."
So God does not bring problems on us. He is not the source of the trials we may face, but he does allow us to be tried, and as the scriptures cited above explain, he will help us, if we rely on him