Take it in good grace什么意思?

Take it in good grace什么意思?
The sentence is about ‘business appointments.
I dont understand that the meaning of ’Take it in good grace“
The whole sentence is 'If he keeps you waiting,however,take it in good grace.'
Thats all

it means
keep your polite manner as usaul and act properly with the clothing tidy as usual though you are waiting