Doubt

Doubt is a strong weapon the devil is using in fighting against faith. As long there is doubt, faith cannot bring any positive result. Faith can carry us to any length; but as long as there is doubt, faith cannot do much work, it can be terminated on the way. That is why we must do everything to overcome doubt.
Doubt is a weakening weapon of faith; it weaken faith and makes faith unproductive. Faith without doubt can remove a great mountain. That is why our Lord and saviour says in

Mark 11:23 For verily I say unto you, That whosoever shall say unto this mountain, Be thou removed, and be thou cast into the sea; and shall not doubt in his heart, but shall believe that those things which he saith shall come to pass; he shall have whatsoever he saith.

Faith is able to remove any kind of mountain, but the only hindrance is doubt.that is why Jesus says,

" And shall not doubt in his heart"
When this doubt is removed, the mountain must surely be removed. Doubt is a great stumbling block to faith carrying out it's great and powerful works. That is the reason we must fight doubt, and do everything to overcome it, in order to be able to exercise our faith and overcome any standing problem before us . The mountain here can be referred to anything disturbing us;. giving us sleepless nights; it may be sickness, disease financial close door, barrenness, Dominic attack, family problems, etc but when we apply faith without doubt this mountain of life will surely be removed