Be sure to guard in your heart the joy of the Holy Spirit, and do not allow the evil one to pour out his bitterness. Beware! Beware, lest the Paradise that exists in you turns into Hell. Nectarios of Aegina
If you begin to guard wealth it will not be yours. But if you begin to distribute it, you will not lose it. Basil of Caesarea
Turn your thoughts away from what will soon pass away, and keep them focused on what is eternal. You will be followed not by armed soldiers but by death to which we are brought closer by every day. Be very careful to guard your soul from all ruinous temptations. John of Shanghai and San Francisco
It is easier to guard a bushel of fleas than a woman. German Proverb
A girl, a vineyard and a bean field are difficult to guard. Portuguese Proverb
He sets the wolf to guard the sheep. Italian Proverb