Hazrat Haji Imdadullah mohajir makki ra said;
“Heart is a like a mirror so protect it from reflecting on any thing other than Allah SWT.”
That is because these useless reflections will waste your time and if you develop a habit of thinking about them all the time they will become permenant dwellers of your heart. Allah SWT save us all from this. Ameen, bijah e Sayyidul mursaleen.