Pray and Remembrance All the Time

The Messenger of Allah SWA related that Allah ordered Yahya Ibn Zakariyya PBUH with five commandments; to act upon them and convey to the Chilren of Israel ... (the fifth one being): "...and I order you to make mention of Allah often, as this is like a man being pursued at speed by the enemy until he reaches a protected fortress and so protects himself inside it, likewise is the servant, he can only protect himself from the shaytan (satan) through remembrance of Allah, the Mighty and Majestic".
[Sahih Al-Jami # 1724]