How do we attain the four discriminations in a future life? Do we have to memorize all the teachings in this life or is it enough to just study them and understand them deeply?
Much more than that. Accumulations of deep wisdom over countless lifetimes are needed.
see here also:
Aya~nhi "dhamma.m pariyaapu.naati sutta.m geyyan"ti-aadiisu (a. ni. 4.102) pariyattiya.m dissati.
In such passages as, “This one studies the Dhamma, the Sutta and the Geyya… dhamma means “the Scriptures”.
"Hetumhi ~naa.na.m dhamma pa.tisambhidaa"ti-aadiisu (vibha. 720) hetumhi.
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