[4:103] When you have performed the prayer, remember God, standing and sitting and on your sides. Then, when you are reassured, observe the prayer, surely the prayer is for believers a prescription at specific times.
The external duties are at determined times, while the presence of the heart in remembrance is continuous without stopping. In terms of the outward practice, it is one time and not another. But in terms of hearts, beware of the absence from what is real for even a moment, no matter what state you are in. Remembrance is for however you are, just as you are. Prayer is when you are reassured.