In this sentence ' وَإِنَّ اللَّهَ لَمَعَ الْمُحْسِنِينَ ' Allah tells us that he will not be with every
and anyone who does 'mujahida', but only with those who practise 'Ihsaan'. This is because mere grinding and empty striving is not the aim, but a'maal (righteous actions) are.
A'maal is mujahida with Ihsaan. Some Sufi's wrongly believe that mere strenuous exercises are what takes one closer to Allah, and they concentrate all their efforts into those things. The Maulana here is refuting that notion.
Ihsaan is sincerety, righteousness and its reality is described in the
That you worship Allah as if you are seeing Him, for though you
don't see Him, He, verily, sees you. (Muslim).
So we all need to perform our good deeds with sincerety, and not show; with heartfeltness, not through coercion; with concentration, not with a million other things in our minds. Then Insha allah, Allah will take us through and help us reach our goal: His Pleasure.
One last word of advice:
That doesn't mean now you can sit contented thinking when Allah subhanahu wa ta'ala will lead us, (and with Allah's lead there is no way we will fail) we can just relax and do nothing. Remember that Allah will only take us to success when he sees the desire in us, the will in us and our efforts towards it. Only then will he favour us with his mai'yyah. As soon as cease wanting, He'll cease taking.