somehow or other always think of Visnu

smartavyah satatam visnu
vismartavyo na jatucit
sarve vidhi-nisedhah syur
etayor eve kinkarah

"The Padma Purana recommends: somehow or other always think of Visnu, without forgetting Him under any circumstances. Actually this is the most basic of all regulative principles. For, when there is an order from a superior about doing someth ing, there is simultaneously a prohibition. When the order is that one should always remember Krsna, the prohibition is that one should never forget Him. Within this simple order and prohibition, all regulative principles are found complete."