Seeing 143 repeatedly is the most reported number experience people have. The conventional reading is that repetition is what makes it noticeable rather than what makes it meaningful — but the number itself still has a structure worth reading.
the 1 reads as initiative and beginning; the reminder that attention is creative, and that what you keep thinking about is what you keep feeding; the 4 reads as structure, effort and foundation; the unglamorous work that makes everything else hold; the 3 reads as expression, creativity and communication; often read as support for something you have been hesitating to say or make.
A mixed sequence is read by its parts rather than as a whole: each digit keeps its own meaning, and the message is the combination.
Life Path 8 channels the power of abundance, authority, and karmic balance. These individuals are here to master the material world while learning that true power is wielded with wisdom, ethics, and responsibility.
The root is the number that stays when the repetition is stripped out, which is why most readers work from it rather than from the raw sequence.
Two things are usually true at once: you are noticing it because you are primed to, and you are primed because something in your attention is already on this.
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Angel numbers are not read as good or bad. 143 points at a quality — what you do with it is the variable.
Mostly that you have started noticing it. The more useful question is what was on your mind when it first registered, because that is usually what the reading attaches to.
Only where it overlaps with something you already had reason to do. A number is not a reason to override your own judgement.