  We study an inflation model with a flat scalar potential supported by
observations and find that slow-roll inflation can emerge after a quasi-cyclic
phase of the Universe, where it undergoes repeated expansions and contractions
for a finite time period. The initial conditions and the positive spatial
curvature required for such nontrivial dynamics align with the quantum creation
of the Universe. The key ingredients that trigger inflation are dissipative
interactions of the inflaton, which are necessary to reheat the Universe after
inflation and thus give us an observational handle on pre-inflationary physics.
Our discovery implies that inflation occurs more robustly after the creation.
