。
Everything will work out.
Literal
All-things [subject-が] well [adverbial-く] goes.
万事 ('all things, everything') is a Sino-Japanese compound — slightly more literary than 全部. うまくいく ('to go well') is the standard idiom for 'work out, go smoothly.' The dictionary form (without ~ている) here expresses a general truth or confident prediction — 'everything will work out' — rather than an ongoing state. A reassuring catchphrase suited for both gentle encouragement and breezy optimism.