For Marriage
Weigh all aspects; if it is favorable, proceed; otherwise, abandon it.
For Business / Deal
Proceed only after study, consultation with experts, and observing Sharia standards (Islamic guidelines); otherwise, do not do it.
فِي الدُّنْيَا وَالْآخِرَةِ ۗ وَيَسْأَلُونَكَ عَنِ الْيَتَامَىٰ ۖ قُلْ إِصْلَاحٌ لَّهُمْ خَيْرٌ ۖ وَإِن تُخَالِطُوهُمْ فَإِخْوَانُكُمْ ۚ وَاللَّهُ يَعْلَمُ الْمُفْسِدَ مِنَ الْمُصْلِحِ ۚ وَلَوْ شَاءَ اللَّهُ لَأَعْنَتَكُمْ ۚ إِنَّ اللَّهَ عَزِيزٌ حَكِيمٌ
Fee alddunya waalakhirati wayasaloonaka AAani alyatama qul islahun lahum khayrun wain tukhalitoohum faikhwanukum waAllahu yaAAlamu almufsida mina almuslihi walaw shaa Allahu laaAAnatakum inna Allaha AAazeezun hakeemun
(Their bearings) on this life and the Hereafter. They ask thee concerning orphans. Say: "The best thing to do is what is for their good; if ye mix their affairs with yours, they are your brethren; but Allah knows the man who means mischief from the man who means good. And if Allah had wished, He could have put you into difficulties: He is indeed Exalted in Power, Wise."