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A safe wallet to use is an open source wallet and we hold the key.
Open source is not enough to make a wallet secure, but using it can be better than using a closed-source wallet.
Consider looking at the case of libbitcoin.
https://milksad.info/disclosure.htmlYou can see several other related links here:
https://bitcointalk.org/index.php?topic=5462652.msg62672463#msg62672463.
You should never have used any closed source wallet-- but being open source is not enough.
By the way, @LibertyMask's post that you quoted was from a month ago, and he didn't even respond to user replies after that.