sentences:  He consistently overruled Angelo Tani, who opposed the branch manager Tommaso Portinari's reckless schemes, and even removed the last checks against Portinari lending excessive amounts to secular rulers, which would be a direct cause of the failure of the Bruges branch.It failed so spectacularly that the long-term viability of the Medici branch was damaged.De Roover detects in the accounting methods of the "libro segreto" a growing distraction by Sassetti, who was increasingly interested in secular humanist activities.