What means this sentence "El escritor se retiró a su despacho con objeto de redactar las ultimas paginas de sus memorias." I can't understand the word "retirarse" in here.

What means this motto? "La cosa tiene que dar vueltas" I dont understand this whole motto

What means this sentence Me gusto sobre todo el gesto que tuvo con los ninos. I know the meaning of the every word but i dont understand the whole sentence. What it means and when i can say sth like this. Thanks for help in advance :)