Perhaps the first thing to think about is: what is a lamp and when do we need one? A lamp in Biblical days is probably synonymous to what we call a lantern or torchlight 🔦 today. They’re used amidst darkness, to give a little light. Better said, the light from a lamp is sufficient enough to help us take the next step but never enough to completely clear out the darkness. In the dark, you must rely on the lamp to know the right step to take i.e. any step you take without it would likely be the wrong one. This also means that if you've been walking without a lamp, just start using it and you'll find your way back to the right track no matter how far off you had gone, but you need to use it consistently. Another analogy to use in thinking about this is the lights of a car.