Ali did not want to elate his companions and tell them falsely...
Ali did not want to elate his companions and tell them falsely: "Because of your having an Imam like Ali you should remain contented, for in any case the present as well as the next world belong to you. It does not matter that you are not united, because your Imam is Imam Ali. There is no harm if you are treacherous because your Imam is Ali. There is nothing to worry even if you do not obey your Imam and do not listen to his words, because you have an Imam like Ali.
If you are bad persons in your mutual relations and as the citizens of your city and country, and pull down your house with your own hands, and are mischievous and corrupt, no harm will come to you, because an Imam like Ali is your ruler.
On the contrary as your enemies are ruled by a tyrant they will always remain wretched and humble and will always be defeated by you even though they may be more united and more honest than you and may be more obedient to their ruler and more useful for themselves and their country than you are. Imam Ali did not tell his companions and his followers any such false things all of which are against the Divine law, and reminded them on all occasions that Allah's laws are unalterable.
However, the supporters of Imam Ali said these false things to themselves and possibly most of them imagined and still imagine that in fact the system and methods of Allah can be changed and it is possibly to derive good results from those things from which all other human beings have derived bad results, and to become honorable, powerful and happy by doing things which have made others base, humble and degraded and ruined their honor, power and happiness.
In another sermon Imam Ali says about jihad: "If a person turns away from jihad considering it to be disagreeable, Allah humiliates him. He is overtaken by calamities. He loses authority and does not receive justice". Here also Imam Ali has not spoken about the spiritual reward for performing jihad for the sake of Allah and defending the frontiers of one's country and one's religion.
He has also not said that, if a person does not perform jihad and a nation forgets the duty of jihad and defense of the country and sits quietly till the enemy launches an attack, will be awarded such and such punishment in the next world. He wants to draw the attention of the people to one of the Divine laws and methods i.e.