On both sides.
Lasting power and purity. It is the difference between refining something in batches and in a continuing process.
Each of us is like a distillation tower in a refinery. We may argue and debate the existence of The One or how it is we are to love others as we love ourselves, but words and beliefs amount nothing to more than an indispensable part of the process.
The products are different but the process is roughly the same in all of them. The raw feed goes into the side of the tower somewhere at or below the middle. The feed that doesn't vaporize leaves out the bottom to be heated up (tested by experience). The excrement is disposed of, but a lot is returned to the structure (mind) to be purified. As ideas move up through each successive tray, it cools. The unwanted material condenses and eventually leaves through the botts. As the vapors are moving up, the purified liquid, having been condensed from the overhead vapors, return to the tower at top and flow down. (The "receiver" can be another tower or storage.) This process is much more efficient and the end products (top and bottom) are far more pure.
Secularism corresponds with bootleg whiskey made in a non-continuous process: inefficient and ultimately a relatively poor quality.
An example of the difference was shown in experiments performed on chimpanzees and human children and seen on PBS. (I mentioned somewhere else.) Both chimps and children were shown how to retrieve a treat by moving some rods with a stick, poking the stick through holes, and then using the stick to retrieve the treat from a slot at the bottom of the box. Shown a box with the same design but with clear sides, the chimps went straight for the treat while the children continued to go through the ritual even though it could clearly be seen to be pointless.
This might be interpreted as showing chimps were more intelligent, but in fact illustrates that, human children, more than the treat is involved.