Nahj al-Balāgha
Hadith 673وَنَاظِرُ قَلْبِ اللَّبِيبِ بِهِ يُبْصِرُ أَمَدَهُ، وَيَعْرِفُ غَوْرَهُ وَنَجْدَهُ. دَاع دَعَا، وَرَاع رَعَى، فَاسْتَجِيبُوا لِلدَّاعِي، وَاتَّبِعُوا الرَّاعِيَ.
He who has an intelligent mind looks to his goal. He knows his low road as well as his high road. The caller has called. The shepherd has tended (his flocks). So respond to the caller and follow the shepherd.