5 So He continued being unable (having no power or ability) to do even one ability (or: make even one power; or: perform [a work] of even one power or ability) there, except for placing [His] hands upon a few ailing folks (sickly ones who had no strength or firmness) [during which] He tended, attentively served, gave treatment to, began therapy with, prescribed ongoing treatment for, or cured and healed [them].
Mark 6:5 Cross References - JMNT
Matthew 13:58
58 And therefore He did not do (or: perform) many demonstrations (exhibitions; works; effects) of power in that place – through their lack of trust and absence of faith and confidence.
Mark 5:23
23 and is repeatedly entreating Him to be his paraclete (or: begs for assistance) many times, continually saying, "My little daughter is now having [her] last [moments] (or: continues holding-on in a way that seems final; = is at the point of death)... Please! (O that!) In coming You can (or: might; would) 'place the hands' on her, to the end that she can be restored to health (be saved; be rescued) and can live! (or: will continue living)"
Mark 9:23
23 So Jesus said to him, "As to your 'if you continue having power and ability,' all things [are] possible to (for; by; in; with) the one habitually trusting (or: progressively believing)." [or, reading with A & other MSS: "About the 'if': you continue being able (having power) to trust (or: to believe). Everything (or: All) {is} endued with power for the one continuously trusting (or: progressively believing; constantly having confidence)!"]
Hebrews 4:2
2 For you see, we are people having been addressed with goodness (or: being brought a message of ease and well-being), even as those folks, also. But the Word (or: message; thought; idea; Logos) which they heard did not profit (or: benefit) those folks – [it] not having been mixed and blended together with faith, trust or loyalty in (or: by; for; with) those at that time hearing [it]. [with other MSS: – {they} not being folks that had been co-mingled by conviction and loyalty with those paying attention and listening.]