Hadhrat Haji Imdadullah Muhajir Makki نوراللہ مرقدہ once explained,
“This world is full of corruption and restlessness, because of which everyone is worried. Noone has any ease or peace, that’s why all people annoyed by this mischief emphasise on coalition and unity.
Every person says, ‘There has to be coalition and unity, so that the worries of this restlessness and corruption come to an end and everyone gains peace and comfort.’ Brother, it’s true that the real remedy for this desease can be only coalition and unity.
But the root of coalition and unity is Tawwadhu (Humility). Without it coalition and unity in the real sense of love and affection can’t be established. Corruption and restlessness always takes places because of Takkabur (pride/arrogance), because if someone thinks of himself as big then he will not accept any opinion [or anything in general] of others. So, in that way no unity can be created.
On the contrary, if everyone adopted Tawwadhu and understood himself less than others definitely he would give importance to their opinions. So, in this way while differences will vanish coalition and unity will be established.
Nowadays the Muslims lack exactly this. Sure, they want to create unity, but the reality and root of it – Tawwadhu – they do not adopt. That’s why the differences are not coming to an end.”
[“Pak-o-Hind ke namoor ‘Ulama-o-Mashaykh” by Hadhrat Maulana Mufti Abdus Shakoor Tirmidhi]