.
Similarly, is having immoral sexual lust, greed, selfishness, hate, anger, jealousy, doubts, etc in our hearts a sin.?
How should we deal with immoral sexual lust in our hearts.?
What does the Bible or Word of God say.?

what's your thought about christian and non christian dating/marriage? millennial nowadays don't care, just date whoever they like, it's like date first then try to convert another half later.

you a christian or not? paul advice not to married with non-believer

.
Please give the Bible quote or quotes which states that we should repent, change and act  according to our divine nature, in dealing with the immoral sexual lust in our hearts.
....... IOW, does the Bible or Word of God say that Christians can be without any immoral sexual lust in their hearts.? Does the Bible say that Chistians can be without any immoral/evil/lawless sexual deeds or sexual sins in their hands, feet and eyes.?

.
So, in effect, you are saying that Christians can deal with immoral sexual lust in their hearts without the guidance of God's Word/laws/commandments as recorded by His prophets and apostles in the Bible, ie just the guidance from the Holy Spirit of God. May I remind you .......

2TIM.3:14-17 (NKJV) = . 14 But you must continue in the things which you have learned and been assured of, knowing from whom you have learned them, 15 and that from childhood you have known the Holy Scriptures, which are able to make you wise for salvation through faith which is in Christ Jesus.

16 All Scripture is given by inspiration of God, and is profitable for doctrine, for reproof, for correction, for instruction in righteousness, 17 that the man of God may be complete, thoroughly equipped for every good work.
.
.
.
PROVERBS.1: =
7 The fear of the Lord is the beginning of knowledge,
But fools despise wisdom and instruction.

Shun Evil Counsel

8 My son, hear the instruction of your father,
And do not forsake the law of your mother;
9 For they will be a graceful ornament on your head,
And chains about your neck.
.

23 Turn at my rebuke;
Surely I will pour out my spirit on you;
I will make my words known to you.

24 Because I have called and you refused,
I have stretched out my hand and no one regarded,
25 Because you disdained all my counsel,
And would have none of my rebuke,
26 I also will laugh at your calamity;
I will mock when your terror comes,
27 When your terror comes like a storm,
And your destruction comes like a whirlwind,
When distress and anguish come upon you.

.
In effect, you have said so by not providing Scripture or the Word of God to backup what you said about how Christians should deal with immoral sexual lust in their hearts, ie ....

....... So, please provide the Scripture/Word of God to affirm this saying of yours.

.
MTTHEW.4:1-4 (NKJV) = Satan Tempts Jesus

4 Then Jesus was led up by the Spirit into the wilderness to be tempted by the devil. 2 And when He had fasted forty days and forty nights, afterward He was hungry. 3 Now when the tempter came to Him, he said, “If You are the Son of God, command that these stones become bread.”

4 But He answered and said, “It is written, ‘Man shall not live by bread alone, but by every word that proceeds from the mouth of God.’ ”
.
.
JOHN.6:63 =  63 It is the Spirit who gives life; the flesh profits nothing. The words that I speak to you are spirit, and they are life. 64 But there are some of you who do not believe.”
.
.
EPHESIANS.6:16-17 = 16 above all, taking the shield of faith with which you will be able to quench all the fiery darts of the wicked one. 17 And take the helmet of salvation, and the sword of the Spirit, which is the word of God;

.
That's was not what you actually said; ....

.
So, from the Scripture and the Holy Spirit, please teach us how do you actually deal with immoral sexual lust in your heart.? Eg MATTHEW.5:27-30 - pluck out your eyes and cut off your limbs.?

.
I can see no Bible quote from you.

Are you saying that Christians should follow your personal quote or sayings.? Are you God/Christ.? ....