Salams

Deen has four essential constituents :-
1-Ibaadat
2-Imaaniyaat
3-Ikhlaakiyaat
4-Muaamlaat (relation b/w humans etc)

But Mazhab has any two above constituents and never comprises of all four.

Thus, Islam is the only true Deen today as it addresses well these four aspects fully and truly.

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“When you do things from your soul, you feel a river moving in you, a joy.” ― Rumi