What you seem to be referring to, is the time prior to Jesus having been "glorified"... such as that to which the following verse refers:
"
39 Now He said this
concerning the Spirit, whom those having believed in Him were about [or, certain/sure to] to receive;
for the Spirit was not yet given,
because Jesus was not yet glorified." John 7:39.
After that point (and like Eph1:13 is exactly saying), it is upon "belief [having believed]" that we are "sealed with the Holy Spirit" (and not some point in time, long afterward).