VERY well stated.
The eternal security of the believer is an essential doctrine. If we believe that we can be saved through Jesus' redemption at the cross and then lost again, then what Christ did at the cross was no different, no truly greater, than the temple offerings of the priests throughout the old testament.
The parable of the sower indicates 2 seeds that definitely weren't true believers, 1 seed that might be a weak believer, and only one seed that definitely was a true believer.
That is the danger of "easy believism." Some seem to receive the word with joy, but then they fall away. If we've told THOSE peoplE that they're "eternally secure," then we've done them a disservice. Apparently, they're in desperate need of initial salvation. And here they are thinking they've got a fire insurance policy.
The best PRACTICAL sign of eternal security is eternal perseverence.