Have you ever been unexpectedly woken up, and found that you just couldn't get going—were you all groggy, feeling like your brain just wasn't working right, and neither was your body? This is a physiological state known as sleep inertia, and it can be brief, but it can also last for very long periods of time! Often people battle it with caffeine, which is a stimulant.
When we become Christians, we can have some worldly inertia, with sin and stuff just trying to resist any change, trying to move forward in our lives with us. Just like sleep inertia, we can battle it with stimulants. Hebrews 10:24-25 tells us what sort of stimulant to take, saying,
"Let us consider how to stimulate one another to love and good deeds, not forsaking our own assembling together, as is the habit of some, but encouraging one another; and all the more as you see the day drawing near." Take every opportunity to get over the grogginess that the world produces—start spending time every day with Christians.
"For the entire Law is fulfilled in in this one word: "You shall love your neighbor as yourself."—Gal 5:14