Vicikicchā: Wavering doubt
Doubt is the hindrance that pins a mind between two roads. At the border, with the spies' report still in their ears, Israel could neither go up nor go back to Egypt, and forty years of walking back and forth is that indecision laid out across sand. A traveler who changes their mind at every fork covers many miles and arrives nowhere.
Kamma: Intentional action
Kamma is deed done with intention, carrying its own weight forward. "Done evil in Yahweh's sight" marks something committed and witnessed, and the refusal at Kadesh traveled with them into every camp after it. Deeds work like debts: the years pass, the amount stands, waiting for the day it comes due.
Vipāka: The ripening of a deed
Vipāka is the fruit an action grows into. Anger burning against Israel is how ripening feels from inside: the heat seems to come at them from elsewhere, though it is their own fire in dry grass reaching back to their field. Forty years is the size that fruit came to, a year counted for each day the spies walked in the land.
Saṃsāra: Wandering on
Saṃsāra is the long faring from birth to birth, and the word plainly means wandering. Tents struck and pitched again, water found and left behind, the same horizon every morning: much movement and no arrival. Israel is not lost in the wilderness, they are kept in it, and that is the difference between a wrong turn and a circle.
Anusaya: Underlying tendency
Anusaya is a bent lying asleep beneath thought that wakes whenever conditions touch it. A whole generation had to be consumed because the readiness to turn back sat deeper than argument could reach; Moses could win the debate and the bent stayed. Roots left in the ground send up the same weed every spring.
Khaya: Exhaustion, the end of a supply
Khaya is an ending that comes by using up. "Until all the generation who had done evil was consumed" sets the term by a count of funerals, so the forty years run exactly as long as the last of those lives. The wilderness outlasts them, and the land waits for children who never stood at that border and said no.