Fighting our own nafs (self) is the greatest jihad. Never let the guard down.
Wage a righteous war against your nafs (desires). Against your eyes for feasting on the impermissible, against your ears for listening to vain speech, against your limbs for sitting in company you should have left, and against your own heart for every time you allowed what was impure to enter it. This is the best struggle.
Guard Your Heart With The Remembrance Of Allah.
The Prophet (PBUH) said: “In the body there is a piece of flesh which, if it is sound, the entire body will be sound, and if it is corrupt, the entire body will be corrupt. Indeed it is the heart.” (Bukhari and Muslim).
The Prophet (PBUH) said: “Allah does not look at the outward appearance or wealth of any one of you; rather he looks at your hearts and deeds.” (Muslim)
Never have I dealt with anything more difficult than my own soul, sometimes it helps me and sometimes it opposes me
~ Imam Ghazali