Assurance of Salvation According To R C Sproul

How can you be sure that you are saved? According to R C Sproul, you need to answer 3 questions:

1. Do you love Jesus perfectly?
2. Do you love Him as much as you ought to?
3. Well, do you love Jesus at all?

For all the questions (especially the third one), it is referring to the Biblical Jesus, and not some other Jesus imagined by men, for example, a good teacher.

Usually, the answer to the first two questions will be "No".

QUOTE
First I ask, "Do you love Jesus perfectly?" Every person to whom I have asked that question has responded candidly, "No, I don't." That’s why they are not sure of the state of their souls; they know there are deficiencies in their affection for Christ, because they know that if they loved Christ perfectly, they would obey Him perfectly. Jesus said, "If you love me, you will keep my commandments" (John 14:15). So as soon as we disobey one of His commandments, that’s a signal to us that we do not love Him perfectly.
Second, when a person acknowledges that he doesn’t love Jesus perfectly, I ask, "Do you love Him as much as you ought to?" The person usually gives me a strange look and says, "Well, no, of course, I don't." That’s right; if the answer to the first question is no, the answer to the second question has to be no, because we’re supposed to love Him perfectly, but we don't. Therein lies the tension that we experience about our salvation.
UNQUOTE

For the third question, if the answer is "Yes", then R C Sproul wrote the following:
QUOTE
So if a person can answer "Yes" when I ask whether he has an affection for Christ, even though he may not love Jesus as much as he ought to (i.e., perfectly), that assures me the Spirit has done this transforming work in his soul. This is so because we do not have the power in our flesh to conjure up any true affection for Jesus Christ.
UNQUOTE

The Spirit himself bears witness with our spirit that we are children of God, (Romans 8:16 ESV)

Therefore I want you to understand that no one speaking in the Spirit of God ever says "Jesus is accursed!" and no one can say "Jesus is Lord" except in the Holy Spirit. (1 Corinthians 12:3 ESV)

The person without the Spirit does not accept the things that come from the Spirit of God but considers them foolishness, and cannot understand them because they are discerned only through the Spirit. (1 Corinthians 2:14 NIV)

For the message of the cross is foolishness to those who are perishing, but to us who are being saved it is the power of God. (1 Corinthians 1:18 NIV)