I dont know if this will help but ive tried. heres what i have, i couldnt find anything about working hard, etc from Guru Nanak, but this is from Guru Arjan Dev Ji:
kutMb jqn krxM mwieAw Anyk audmh ] For his family, he works very hard; for the sake of Maya, he makes countless efforts. kutamb jatan karnaN maa-i-aa anayk udmah. hir Bgiq Bwv hIxM nwnk pRB ibsrq qy pRyqqh ]1] But without loving devotional worship of the Lord, O Nanak, he forgets God, and then, he is a mere ghost. ||1|| har bhagat bhaav heenaN naanak parabh bisrat tay paraytah. ||1|| qutVIAw sw pRIiq jo lweI ibAMn isau ] That love shall break, which is established with any other than the Lord. tutrhee-aa saa pareet jo laa-ee bi-ann si-o. nwnk scI rIiq sWeI syqI riqAw ]2] O Nanak, that way of life is true, which inspires love of the Lord. ||2|| naanak sachee reet saaN-ee saytee rati-aa. ||2||
I dont know of that would help... i tried *shrugs shoulders with a smile*