Nothing but prayer can make saints because nothing but God can make saints and we meet God in prayer. Prayer is the hospital for souls where we meet Doctor God.

The saints too had wandering minds. The saints too had constantly to recall their constantly wandering mind-child home. They became saints because they continued to go after the little wanderer like the Good Shepherd.

Its the most essential thing of all just because its not a matter of how you do it at all but of whether you do it. Like being born or cooking how you do it is less important than whether you do it. You can find thousands of books on prayer that give you methods of praying hundreds of hows but they do you no good at all unless you actually pray. Otherwise its like reading a cookbook instead of cooking. You cant eat a cookbook

Praying anywhere can easily become praying nowhere just as praying anytime can easily become praying at no time. Everything in general becomes nothing in particular.